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 Заголовок сообщения: Birth Control Pills Affect Women's Taste in Men
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http://www.sciam.com/article.cfm?id=bir ... mens-taste

Birth Control Pills Affect Women's Taste in Men

How synthetic hormones change desire in women--and their choice in a mate

By Melinda Wenner


This year 2.25 million Americans will get married—and a million will get divorced. Could birth control be to blame for some of these breakups? Recent research suggests that the contraceptive pill—which prevents women from ovulating by fooling their body into believing it is pregnant—could affect which types of men women desire. Going on or off the pill during a relationship, therefore, may tempt a woman away from her man.

It’s all about scent. Hidden in a man’s smell are clues about his major histocompatibility complex (MHC) genes, which play an important role in immune system surveillance. Studies suggest that females prefer the scent of males whose MHC genes differ from their own, a preference that has probably evolved because it helps offspring survive: couples with different MHC genes are less likely to be related to each other than couples with similar genes are, and their children are born with more varied MHC profiles and thus more robust immune systems.

A study published in August in the Proceedings of the Royal Society B, however, suggests that women on the pill undergo a shift in preference toward men who share similar MHC genes. The female subjects were more likely to rate these genetically similar men’s scents (via a T-shirt the men had worn for two nights) as pleasant and desirable after they went on the pill as compared with before. Although no one knows why the pill affects attraction, some scientists believe that pregnancy—or in this case, the hormonal changes that mimic pregnancy—draws women toward nurturing relatives.

Women who start or stop taking the pill, then, may be in for some relationship problems. A study published last year in Psychological Science found that women paired with MHC-similar men are less sexually satisfied and more likely to cheat on their partners than women paired with MHC-dissimilar men. So a woman on the pill, for example, might be more likely to start dating a MHC-similar man, but he could ultimately leave her less sexually satisfied. Then if she goes off the pill during the relationship, the accompanying hormonal changes will draw her even more strongly toward more MHC-dissimilar men. These immune genes may have a “powerful effect in terms of how well relationships are cemented,” says University of Liverpool psychologist Craig Roberts, co-author of the August paper.

Note: This article was originally published with the title, "A Tough Pill to Swallow".


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Где-то об этом читала...
Не знаю как насчет изменения предпочтений, а либидо снижается почти у всех и существенно...



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Никогда не думайте, что несколько неравнодушных людей не могут изменить мир.
На самом деле они единственные, кому это удавалось. (c) Маргарет Мид
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Вот ещё:

http://www.cbsnews.com/stories/2008/08/ ... 7457.shtml

Pill Users Choose 'Wrong' Sex Partners

Women on Birth Control Pill May Be Attracted to 'Wrong' Sex Partner

(WebMD) A woman is sexually attracted to men who smell like a good genetic match, but birth control pills make her desire the "wrong" men, a U.K. study shows.
Who is the right man? Studies suggest women are attracted to men whose genetic makeup differs from their own. Having a genetically different mate increases the chances for a healthy pregnancy and a healthy baby .
"If this really happens in the real world, women on the pill would end up choosing a more genetically similar mate than she would otherwise choose and the implications go on from there ," study researcher S. Craig Roberts, PhD, tells WebMD.
Roberts notes that in an earlier U.S. study, women who were genetically similar to their partners reported being less satisfied in their sexual relationship with their partner -- and were seeking more new sex partners -- than were women with genetically dissimilar partners.
Animal studies show that female mammals can smell out males whose MHC genes are different from their own. MHC genes affect important immune responses. By mating with males who have different MHC genes, females give their offspring a better disease-fighting repertoire.
It's true of humans, too. In laboratory studies, women who sniff men's sweaty T-shirts find them more attractive when they come from men whose MHC genes don't match theirs. It's not that certain MHC genes smell better to women -- it's the difference that counts.
Rachel Herz, PhD, author of The Scent of Desire and a faculty member at Brown University, says there is a real connection between body odor, MHC, and the mates a woman chooses.
"My own research says the way a man smells to a woman is the main determinant of sexual attraction," Herz tells WebMD.
In earlier T-shirt-sniffing studies, women taking birth control pills seemed to be attracted to the "wrong" men. Intrigued, Roberts and colleagues took a closer look.
They paid 37 women to smell men's T-shirts before and after going on the pill. Then they compared the women's before- and after-pill ratings of the odors to those of 60 women who did not use oral contraceptives .
The result: After taking the pill, women shifted toward preferring genetically similar men. Women who did not take the pill slightly increased their preference for genetically different men.
Why? Roberts notes that when they become pregnant, female animals switch to preferring the scent of genetically similar males. This may allow them to seek out males that will help them protect and raise the baby. Claus Wedekind, PhD, who performed the original T-shirt-sniffing studies, has suggested that birth control pills somehow mimic this process.
The question, of course, is what happens when a woman taking birth control pills marries a man to whom she's attracted -- and then stops taking the pill.
Herz says marriage counselors who have never heard about these studies tell her that the No. 1 complaint among women no longer sexually interested in their husbands is that they can no longer stand how he smells.
"If you can't stand how someone smells, you cannot become intimate," Herz says.
Does this mean the birth control pill is a divorce pill? Herz says it's not that simple.
"A woman's response to a man's natural body odor will be colored by her feelings for him," she says. "So if you fell in love with a man online, it would be hard to be repelled by his smell."
Roberts and colleagues report their findings in the Proceedings of the Royal Society B: Biological Sciences.

By Daniel DeNoon
Reviewed by Louise Chang
©2005-2008 WebMD, LLC. All rights reserved.


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А может с этими же механизмами связано изменение сексуальных предпочтений в ходе HRT - когда некоторые МТФ-лесби склоняются в сторону предпочтения мужчин в качестве партнеров?



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Никогда не думайте, что несколько неравнодушных людей не могут изменить мир.
На самом деле они единственные, кому это удавалось. (c) Маргарет Мид
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Рысь
нет, МтФ-лесби раскрепощаются психологически после осознания транссексуальности, а еще больше - когда слышат от мужчин комплименты и ловят на себе вожделеющие мужские взгляды. Это очень льстит, ТС только и надо, чтоб ей каждый день почаще говорили: "Ты женщина, ты женщина".


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