ON OVULATION, PERIOD, INFERTILITY, SEX, ORGASM,
PREGNANCY, PMS, MENOPAUSE, ETC.
Window of opportunity only six days – All pregnancies resulted from sex
on day of ovulation or one of the 5 days before.
By Kim Painter – USA Today
The facts of life may not be quite what you think. Scientists dispel
some of the more enduring myths about human conception with a new study
that pinpoints the long. sought window of fertility - the time during a
woman's monthly cycle when she can become pregnant. That Window
consists of six days: the day of ovulation and the five days leading up
to it, the study says. Just one day after ovulation, the window appears
to be firmly closed, at least for most women, says the report in
Thursday's New England Journal of Medicine.
In fact, "the more Inter- course you have, the greater chance you
have of getting pregnant, " Wilcox says. ~ Contrary to claims made In
several popular books, the timing of sex had no effect on gender.
But he says sex on the day of
ovulation
or the two days before produced the vast majority of pregnancies in his
study as well.
A New Rhythm Method to Get Pregnant
Study finds earlier, shorter period for fertilization
By Curt Suplee – Washington Post Service
WASHINGTON -Couples who are trying to get pregnant, or trying not
to,
may need to change the rhythm of their method, according to a new
study.
Researchers reported in Thursday's The New England Journal of Medicine
that
the highest probability of pregnancy each month occurs during a 4
six-day
period ending on the, day of ovulation, a time frame.
The researchers found that all pregnancies in the study group were
initiated on the day of ovulation or during the five previous days;
none was produced by intercourse after this interval.
Thursday May 3 5:30 PM ET
Enzyme Helps Sperm Fertilize Egg
By Amy Norton
NEW YORK (Reuters Health) - Japanese scientists have
discovered an
enzyme that is key in allowing sperm to penetrate an egg. They
say the
finding may potentially lead to a male contraceptive.
The enzyme phospholipase C (PLC) has been known to exist, in
various
forms, in the eggs and sperm of mammals. But exactly what these
PLC
variations do remains unclear, Kiyoko Fukami of the University
of
Tokyo told Reuters Health.
NEW YORK (Reuters Health) - Could love truly be in the air?
Researchers in Texas believe men become especially attuned--and
attracted to--female body odors during the most fertile stage of the
menstrual cycle.
``These findings raise serious doubts about conventional scientific
wisdom that human female ovulation is concealed...and that men cannot
detect when women are
ovulating,'' according to Drs. Devendra Singh and P. Matthew Bronstad,
psychologist researchers at
the University of Texas in Austin.
``These findings suggest that ovulation may not be concealed and that
men could use ovulation-linked
odors in their mate selection,'' Singh and Bronstad conclude.
SOURCE: Proceedings of the Royal Society of London 2001;268:797-801.
NEW YORK (Reuters Health) - Factors such as age, confidence in
one's sexual prowess and preference for either ``fast'' or ''slow''
sex help
determine how often men and women achieve orgasm, according to a
new survey of more than 2,200 adults in Finland.
Overall, individuals ``who have developed a perception that they are
skilled and experienced lovers are more orgasmically responsive''
Wednesday March 1, 2000
Big teen secret: most are not having sex
NEW YORK, Mar 01 (Reuters Health) -- While 3 out of 4 American
teens assume that
most of their peers are having sex, only 40% of teens say
that they've actually had sexual
intercourse, according to a national survey released this
week by Seventeen Magazine.
However, the majority of teens are indeed sexually active.
Fifty-five percent of teens say
they have had oral sex, although 40% do not define oral sex alone
as being ``sex.'' Over half
said they thought that oral sex was ``gross.''
Friday September 24 6:26 PM ET NEW YORK, Sep 24 (Reuters Health)
-- Worldwide, the average age that men lose their virginity is 15, and
for women, 16, according to an international survey of 16 to 21 year
olds. The 1999 survey, which included 4,900 sexually and non-sexually
active individuals from 14 countries -- also showed that young people
have sex about 98 times a year, and about half expect to have sex
within the first month of meeting a new partner. ``Kids are having sex
much younger'' than in previous years but ``they are using condoms.
They're protecting themselves in ways other generations haven't,''. Not
all of the 16 to 21 year olds were sexually active. The most popular
reason for remaining a virgin was because they
were not ready for sex (47%) or they ``have not met the right person''
(27%).
``I think what we owe to the next generation is good information and
good
family connections, where the family can take charge and be able to
educate
their kids about sex and sexuality,''
Nov 99 Noting that 87% of the girls with STDs had no symptoms
when they came to the clinic, Bunnell and her team emphasize that ''frequent screening for
STDs is critical for sexually active adolescents,'' and recommend screening for chlamydia
every 6 months.
Friday February 4, 2000 Low-fat vegetarian diet may reduce PMS symptoms
NEW YORK, Feb 04 (Reuters Health) -- Consuming a low-fat,
vegetarian diet appears to
reduce the length and severity of menstrual cramps and other
premenstrual symptoms, US
researchers suggest.
According to the study in the February issue of the journal
Obstetrics & Gynecology,
menstrual cramps are caused by prostaglandins, substances
that come from traces of fat
stored in cell membranes in the uterus. Sex hormones such
as estrogen drive production of
prostaglandins.
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Friday September 14, 2001
Sexual Decline in Women Due to Aging, Menopause
By Melissa Schorr
NEW YORK (Reuters Health) - Women experience a decline in
sexual responsiveness later in life as a result of both aging and
menopause, Australian researchers report.
And, the study's authors suggest, other aspects of sexuality
probably also decline as a direct result of menopause.
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Tuesday November 27, 2001 1:26 PM ET
US Is World's Sexual Superpower
By Rodney Joyce
WELLINGTON, New Zealand (Reuters) - The United States remains the
sexual superpower of the
world with Americans making love more often and with more partners than
any other nationality,
according to a survey by a leading condom manufacturer.
Durex said on Tuesday that its annual poll of 18,500 people in 28
countries showed the world was
having more sex and starting earlier than ever before, and the United
States was leading the field in all
departments.
Thursday March 29, 2001 2:22 PM ET
Morning-After Pill Found to Work 5 Days
After Sex
By Melissa Schorr
NEW YORK (Reuters Health) - A new
study by Canadian researchers questions
the conventional wisdom that women who
have had unprotected sex must use
emergency contraception within 72 hours to prevent an unwanted
pregnancy.
The investigators found that taking so-called ''morning-after'' pills 3
to 5
days after having unprotected sex was up to 87% effective in preventing
pregnancy, while receiving the treatment within 3 days, as has been
recommended for decades, was up to 90% effective.
[within 5 days doctor can install a sterileIUD inside the womb
Tuesday June 20, 2000 Less Time With Partner, More Interest in
Sex
NEW YORK (Reuters Health). According to researchers, the less time a
man spends with his
female partner after having sex, the more attractive he finds
her--and the greater his interest
in having sex with her again. This phenomenon may arise from an
evolutionary strategy
known as ''sperm competition,'' according to Todd K. Shackelford,
an assistant professor
of psychology in the College of Liberal Arts at Florida Atlantic
University.
``The bottom line here is that we find (this) effect for men
but not for women,'' he said.
Shackelford and his colleagues presented the findings at the
107th Annual Convention of the
American Psychological Association, held earlier this month in
Miami.
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Thursday January 11, 2001 1:33 PM ET
Women's Mental Skills Vary During Monthly
Cycle
NEW YORK (Reuters Health) - Hormones may help explain some of the
differences in the ways that men and
women think, according to a report.
As a rule, women outperform men on tests of verbal skills, while men
tend to score better on tests measuring
spatial abilities, which include such skills as rotating an object
mentally. Some research suggests that the
differences may be explained in part by varying levels of hormones in
men and women.
``We conclude that spatial performance is sensitive to hormonal
fluctuations over the menstrual cycle and that
different aspects of spatial abilities are related to different
hormones or hormone combinations,'' the authors
write.
--------------------------------------------------------------------------------------
High Ozone Levels Hurt Sperm Count, Study Finds
Fri Apr 19, 2002 5:57 PM ET
By Kathleen Doheny
RANCHO MIRAGE, California (Reuters Health) - Ozone can
adversely affect a man's sperm, reducing their numbers as well as their
crucial ability to move or "swim," according to new research that
evaluated more than 14,000 sperm samples.
"Our most significant finding was that as the ozone level went up, the
sperm concentration went down," said Dr. Rebecca Z. Sokol, a
professor of medicine and obstetrics and gynecology at the University
of
Southern California's Keck School of Medicine. Sokol presented her
findings here Friday at a meeting of the Pacific Coast Reproductive
Society.
-------------------------------------------------------------------------------------- Number of Sex Partners Key in
Cervical Cancer Risk Tue May 7, 2002 1:29 PM ET
By Jacqueline Stenson
LOS ANGELES (Reuters Health) - The number of sexual partners a
woman has had may be a key factor that helps doctors determine whether
precancerous cervical changes should simply be closely watched or
surgically treated, according to a new study.
It found that women who have had more than five partners are at
increased risk of cervical abnormalities progressing to cancer.
Another strong determinant is whether a woman is infected with
human papillomavirus,
or HPV, a virus believed to contribute to nearly all cervical cancers,
said
Dr. John K. Chan of the University of California, Irvine.
While having multiple sex partners increases a woman's risk of
contracting HPV and, as a result, her risk of developing cervical
cancer and "precancer," the study results showed that having more than
five sexual partners was an independent risk factor for precancerous
cervical abnormalities, even when a woman did not carry HPV.
Biological Clock Starts Ticking in Late 20s: Study Tue Apr 30, 2002 10:33 AM ET
LONDON (Reuters) - A woman's biological clock starts ticking in her
late 20s, not her mid-30s, and male fertility also begins to wane with
age, doctors said Tuesday.
In what is thought to be the first study to show a drop in female
fertility below the age of 30, researchers in the United States and
Italy said their results do not mean older couples will not be able to
conceive, it just might take them longer.
"Although we noted a decline in female fertility in the late 20s,
what we found was a decrease in the probability of becoming pregnant
per menstrual cycle, not in the probability of eventually achieving a
pregnancy," said Dr. David Dunson of the National Institute of
Environmental Health Science in North Carolina.
The doctors estimated the chances of conceiving during the peak
time, or fertile window, in the woman's monthly cycle for couples in
three
age groups: 19 to 26 years, 27 to 34 years, and 35 to 39 years.
Kindness, Intelligence
Important in Mate Selection Wed May 29, 2002 5:35 PM ET
By Charnicia E. Huggins
NEW YORK (Reuters Health) - The idea that men are interested in a
woman's beauty while women are interested in the size of a man's wallet
is overly simplistic, according to new study findings.
The truth is, though attractiveness and income may indeed be factors of
interest, qualities such as kindness and creativity are also very
important, researchers report.
Men: Breaking Up Is Bad Only if Women Do It First Tue Jun 11, 2002
By Alison McCook
NEW ORLEANS (Reuters Health) - When rating previous breakups, women
view the process of ending of the relationship no differently if they
are the dumper or the dumpee--but the same is not true with men, new
research shows.
According to researchers at Francis Marion University in Florence,
South Carolina, men believe there was much more scheming on the part of
their partners, less finality in the relationship and less working
together during the breakup if they were dumped than if they ended the
relationship themselves.
For example, when rating how much scheming went into the breakup,
"females don't differ much whether they were the actor or the target,"
Dr. Mike
Jordan told Reuters Health.
"The males, on the other hand--if they're the ones who did it, they
thought 'Oh, there was no plotting on my part or anything.' But there
was a lot if she broke up with them," he added.
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Extracted from Independent.co.uk
By Roger Dobson
11 August 2002
Men whose jobs involve sitting down for more than six hours a day may
be reducing their chances of fathering children.
Researchers, who have designed special thermometers to fit into male
underpants, found that sitting down for more than one hour led to
significant increases in scrotal temperatures, something that is been
linked to poorer-quality sperm.
"A high scrotal temperature is a common finding in infertile patients,
and experimental studies indicate that specific types of heat exposure
reduce semen quality," say the researchers.
"More and more men have a sedentary work position, which increases
scrotal temperature. Normal sperm production depends on a testicular
temperature below body temperature."
Soy May Help Keep Postmenopausal Arteries Healthy
Tue Aug 20,2002 10:21 AM ET
NEW YORK (Reuters Health) - A Western diet rich in tofu and other soy
products may help protect older women from artery disease, new study
findings suggest.
According to the report, phytoestrogens were associated with less
artery stiffness among more than 400 postmenopausal women. The benefit
was most
pronounced among the oldest women, or those who had been postmenopausal
the
longest.
Arterial stiffness increases as the blood vessel disease
atherosclerosis progresses, and atherosclerosis can lead to heart
attack or stroke, explain researchers in the August issue of
Arteriosclerosis, Thrombosis and Vascular Biology: A Journal of the
American Heart Association ( news - web sites).
More Teens Lose Virginity in June, December
Wed Nov 13, 2002 5:09 PM ET
By Keith Mulvihill
NEW YORK (Reuters Health) - Teens are much more likely to lose their
virginity during the months of June and December than at any other time
of the year, a new study has found.
The findings suggest that parents and sex education professionals
should involve teens in discussions about sex just prior to the onset
of summer and
again before the winter holiday season, according to lead author Dr.
Martin
L. Levin of Mississippi State University.
Upwards of 19,000 adolescents in grades 7 through 12 participated in a
survey that identified the month that they had sexual intercourse for
the first time
and whether or not the act was with a romantic partner or a casual
fling. The findings are published in the November issue of the Journal
of Marriage and Family.
In general, most teens reported that if they had lost their virginity,
they had done so in June. The next most popular month was December.
The analysis confirms the "summer vacation" theory for adolescent
females and is now extended to adolescent males, according to the
report. The seasonal effect associated with losing one's virginity was
stronger in white adolescents than non-whites.
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The sperm can survive for a week. The egg is
more
short lived.
Ovulation is 11 to 16 days after start of period.
New researchshows the sperm swims towards female egg due to the egg's
attraction.
------------------------------------
DL: ideally a woman on period should have a break - if I had a partner
during my period I'd leave (/he leave - we taken turns).
LONDON (Reuters) - Although the risk is small and it is more likely to
result from heavy drinking and smoking, scientists have uncovered
evidence that oral sex can cause mouth cancer.
Researchers had suspected that a sexually transmitted infection that is
linked to cervical cancer could also be associated with tumors in the
mouth.
Now a study by researchers working for the International Agency for
Research on Cancer (IARC) in Lyon, France seems to have confirmed it.
"Oral sex can lead to oral tumors," New Scientist magazine said
Wednesday, referring to the latest research.
The scientists studied more than 1,600 patients from Europe, Canada,
Australia, Cuba and the Sudan with oral cancer and more than 1,700
healthy people.
They found that patients with oral cancer containing a strain of the
human papilloma virus (HPV) known as HPV16 were three times more likely
to report having had oral sex than those without the virus strain.
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2005
Women's Brains Really Blown By Orgasms
An orgasm is literally a mind-blowing experience for a woman, scientists have revealed.
Much of her brain shuts down when she reaches a sexual climax.
The discovery was made during experiments in the Netherlands when couples' brains were scanned during lovemaking.
Neuroscientist
Dr Gert Holstege, from the University of Groningen said it appeared
that shutting down the brain during orgasm ensured that obstacles such
as fear and stress did not get in the way.
"When you are fearful
or have a very high level of anxiety, then it's hard to have sex
because during sex you really have to give yourself and let go."
Men
were studied in the same way but because the male orgasm typically
takes such a short time it was difficult to obtain meaningful brain
scan data.
Sex vs. Intelligence: Bigger balls mean smaller brain
mongabay.com
December 13, 2005
In a recent study of bats, Scott Pitnick, professor of
biology at SyracuseUniversity,
found that testis size is inversely related to brain size. In other words, the
bigger the balls of a bat species, the smaller its brain.
Comparing brain size and testis size for 334 species of
bats, Pitnick's team looked to explore the contribution of sexual selection to
brain evolution. Specifically, the research tested and confirmed two theories:
larger testis are found in males with smaller brain size,
and relative testis depends on female promiscuity.
Pitnick and his team showed that among bat species, those
with promiscuous females have relatively smaller brains than species with
females that are faithful to their mates. The study also found that male
infidelity, by contrast, had no evolutionary impact on relative brain size.
Pitnick says a likely explanation for this relationship
relates to the energetic demands of producing and maintaining both brain and
sperm cells; males cannot afford a lot of both. Under this explanation, males
with relatively large testes and small brains leave more offspring than
larger-brained, less fertile, competitors.
“When females mate with more than one male, sperm compete to
fertilize the female’s eggs. Such ‘sperm competition’ is rife in many bat
species, perhaps due in part to the unusual ability (among mammals at least) of
sperm to survive inside the female’s reproductive tract for a very long time,”
says Pitnick. “The male who ejaculates the greatest number of sperm may win at
this game, and hence many bats have evolved outrageously big testes—as much as
8.5% of their body mass. Because they live on an energetic knife-edge, bats may
not be able to evolutionarily afford both big testes and big brains. We’re
excited about these results, as they may stimulate more research into the
correlated evolution of brains, behavior and the extravagant and costly
ornaments and armaments favored by sexual selection.”
The finding is consistent with research conducted on
primates.
Frequency of ejaculation according to 2 different books (they both could be wrong):
Up to ago 45: once a week
46-50: once every 1.5 weeks
51-59: once every month
over 60: never
----------
formula: age divided by 5
e.g. 40 year old: once every 8 days
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WARNING: "Condoms break more often than the manufacturers like you to believe". This is what a pharmacist said.
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How do you use a male condom?
A drop or two of water-based lubricant or saliva may be placed inside
the condom to facilitate rolling the condom down over the tip of the
erect penis. The tip of the condom is not pulled tightly against the
penis -but rather a half-inch of space is left as a reservoir to
collect semen. If not circumcised, the foreskin should be pulled back
to increase sensation in men who are not circumcised before the condom
is rolled down the length of the penis. One hand is used to pinch the
air out of the tip to avoid friction against air bubbles (which is
thought to be responsible for most condom breaks). The other hand is
used to roll the condom down to the base of the penis. All air bubbles
should be smoothed out of the condom before insertion into the vagina.
After intercourse the condom should be held against the base of the
penis as the penis is withdrawn to avoid spillage of semen.
extract from article by sexualityandu.ca
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"Because of recent findings, many
condom manufacturers in the United States have stopped using
nonoxynol-9 and the Centers for Disease Control and Prevention (CDC) no
longer recommends using condoms with spermicide.
Use a lubricant to reduce friction and tearing during intercourse."
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"Vaginal Spermicides: Advantage
24, Vaginal Contraceptive Film and other spermicides can be used for
vaginal intercourse, offering some protection against unplanned
pregnancy and possibly some STIs. Note: If you or your partner
develop an irritation from a spermicide, stop using it. These
irritations may increase your risk of getting an infection like HIV."
Here's an interesting statistic in regards to abortion. The
national crime rate dropped by about 23% in the 20 years following Roe vs Wade.
No big surprise there, but something that rarely gets mentioned. And for those
who will claim that the drop in crime was not related to the legalisation of
abortion, I would point out that 5 states legalized abortion approximately 5
years before Roe v Wade and all 5 states showed a drop in crime preceding the
rest of the nation. fpdoc1234
ST. LOUIS - Songbirds may be the Sinatras of the animal world, but male
mice can carry a tune too, say Washington University researchers who
were surprised by what they heard.
Scientists have known for decades that male lab mice produce
high-frequency sounds — undetectable by human ears — when
they pick up the scent of a female mouse. This high-pitched babble is
presumably for courtship, although scientists are not certain.
But it turns out those sounds are more complex and interesting than previously thought.
"It soon became ... apparent that these vocalizations were not random
twitterings but songs," said researcher Timothy Holy. "There was a
pattern to them. They sounded a lot like bird songs."
------------------------------------------------------------------------------------------------------
Male sweat can boost arousal in women
BERKELEY, Calif. - A chemical in male sweat can boost mood, brain
activity and sexual arousal in heterosexual women, according to a new
study released just in time for The study offers the first direct
evidence that humans secrete a scent that can affect the physiology of
the opposite sex, said researchers at the University of California,
Berkeley. Their findings were published this week in The Journal of
Neuroscience.
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According to evolutionary
psychology (these apply to animals close to humen but as humen we can
overcome some of these biological dictates)
For man the imp thing is pleasure in sex and continuity
For woman imp thing is pleaseure in kids and continuity
Neither one cares for the other except for the above
Until there is love and friendship
sometimes a woman can have a second ovulation during her cucle. This
ovulation can happen during her period so woman can get pregnant with
sex during her period.
woman can have period even if she's pregnant.
machine that tests urine every morning can detect hormones as soon as they're present (5 days before ovulation).
temperature test only picks up when ovulation is there and to determine
when the fertile period starts it has to be guessed based on past
record of number of days of cycle.
---------------------------
"You have a need in an evolutionary sense for both money and women.
They trigger the same brain area," said Camelia Kuhnen, a Northwestern
University finance professor who conducted the study with a Stanford
University psychologist.
---------------------------
Overall, those who said they had sex less than once per week were twice
as likely to develop ED over the next five years as men who had sex at
least once a week. Furthermore, compared with men who had sex three or
more times per week, their ED risk was increased nearly four-fold.
A number of factors contribute to ED development, many of which could
also affect a man's sexually activity -- such as age, diabetes and
heart disease. However, after taking account of those factors, sexual
activity itself remained linked to ED risk, Koskimaki's team found.
It may be a matter of "use it or lose it," according to the
researchers. Just as exercise boosts physical fitness, they note,
regular sexual activity may help a man preserve his erectile function.
ED occurs when there are problems with blood flow to the penis. Regular
sexual activity, Koskimaki's team writes, may help maintain healthy
blood vessel function in the erectile tissue.
SOURCE: American Journal of Medicine, July 2008.
--------------------------- Kissing build immune system
Writing
in the journal Medical Hypotheses, researcher Dr Colin Hendrie from the
University of Leeds, said: "Female inoculation with a specific male's
cytomegalovirus is most efficiently achieved through mouth-to-mouth
contact and saliva exchange, particularly where the flow of saliva is
from the male to the typically shorter female." Kissing the same person for about six months provides the best protection, he added. As
the relationships progresses and the kisses become more passionate, the
woman's immunity builds up, cutting her odds of becoming ill. By the time she becomes pregnant, the odds of her unborn baby becoming infected are much lower.
---------------------------------
2012
"Without a doubt, a discreet anatomic entity called the
G-spot does not exist," said Dr. Amichai Kilchevsky, a urology resident at Yale-NewHavenHospital
in Connecticut, and lead author
of the review, published Jan. 12 in the Journal of Sexual Medicine.
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