Animal research has found that isoflavones and estrogen can have a negative affect on reproduction, including decreased fertility.
Journal of Human Reproduction
Animal research has found that isoflavones and estrogen can have a negative affect on reproduction, including decreased fertility.
Journal of Human Reproduction
Research has found that too much soy intake (including tofu, tempeh, tofu or soy “meats,” soy milk, cheeses, yogurts, ice creams, & soy energy bars) may sink a man’s sperm count. A study in the journal HUMAN REPRODUCTION found that men who ate the equivalent of one soy tofu burger or drank one cup of soy milk every 2 days had 41 million fewer sperm per milliliter of semen than those who didn’t eat/drink soy (normal sperm counts are between 80-120 million per milliliter). The reason may lie in the fact that soy products contain plant estrogens which have been found to affect overall fertility.
Although this research is interesting, it does not mean men should stop eating/drinking soy. Critics argue that the researchers who did the above study failed to take into account the subject’s medical histories or other conditions that may have contributed to the lower sperm counts. In addition, generations of Asian men who regularly consume soy products have not been found to have decreased sperm counts. The sperm count decreases may have more to do with a man’s weight than his soy intake. Overweight men produce more estrogen, which can interfere with normal hormone production. Since American men are more likely to be overweight than Asian men, this helps explain why the study found these differences. Balance is the key here – taking care of yourself and eating a healthy diet are both key to healthy sperm production.
Research has found that 14% of Americans admit to engaging in sex while at work.
Adam & Eve, 2009
Women who are engaging in vaginal sex report higher levels of masturbation – but men who are engaging in vaginal sex report lower levels of masturbation.
Archives of Sexual Behavior, 2008
The average married couple has sex 58 times each year – although couples under the age of 30 do it an average of 111 times per year.
General Social Survey, 2009
A recent article in the New York Times found that the average married couple has sex 58 times per year (about once a week). Those under 30 do it a bit more (111 times per year) than older couples. Interestingly, 15% of couples haven’t done the deed in the last 6 months to one year. Researchers are trying to learn why sexual frequency decreases in marriages and why some marriages become “sex-less.”
Discrepancies in desire (having different levels of interest and/or desire for sex) are common in couples – whether they are married, living together, dating, straight, or gay. In a perfect world every couple would desire sex just as much as their partner but this is uncommon in real life. Overall the research has found that men have greater sexual motivation, stronger and more insistent sexual feelings, and have more liberal attitudes about sex compared to women. There are certainly exceptions to this, but for the most part it’s men who are more interested in sex. Why is this?
Unfortunately there is no clear-cut answer for these differences. While there is ample research to indicate that it might be sex hormones at fault, it’s also important to look at social and cultural issues. Women’s sexuality is enormously affected by social norms and values - while there are many mixed message, the overwhelming message to women is ”good girls don’t.” At the college level, women with high levels of sexual desire and interest are often labelled ”sluts,” which helps push them back into acceptable behavior.
But I’m getting off on a tangent here – let’s get back to the sexless marriages. While the discrepancies in desire can lead to lower levels of sexual behavior, there are clearly other things going on. Couples are stressed, overwhelmed, and maybe even a little bored of their partners. The exciting sex that happened at the beginning of the relationship is often replaced with let’s-get-it-done-before-the-kids-wake-up kind of sex. How do couples get it back? A good friend of mine talks about a concept he calls the RED BULL HIGH. In order to get the Red Bull High, a couple allows his or her partner to have sex outside the marriage (just once, or maybe just a couple of times, he’s still working on the exact number here). He believes that allowing outside sexual partners can bring back passionate sex. After talking at length with his wife (they have very good communication), she had sex with someone else and then brought the experience back into the marital bedroom. They have found that this has led to more passionate and intense marital sex. The question is: what are the costs of the Red Bull High? Are they worth it to bring back passionate sex? Would you let your partner have sex with someone else? Would you want to have sex with someone other than your partner? Why or why not?
Research has found that 95% of people never detail their sexual fantasies to another person.
Who’s Been Sleeping in Your Head, 2009
According to London psychotherapist and clinical researcher Brett Kahr, virtually every sexually mature adult generates sexual fantasies that fulfill a wide variety of often unconscious psychological needs. Fantasies include themes of rape, infidelity, homosexuality, pedophilia, incest and, apparently for some Brits, kinky sex with the queen and Margaret Thatcher. Based on the largest-ever survey of sexual fantasies, and drawing on the author’s twenty-five years of clinical practice, this “anatomy of secret desire” does for sexual fantasy what Kinsey did for sexual behavior. However, unlike Kinsey’s books, which were dense and data-driven, Who’s Been Sleeping in Your Head? features narrative accounts of sexual fantasies and the author’s own insightful interpretations of how those fantasies affect our lives. Kahr reveals the astonishing truth behind secrecy, shame and taboo, and demonstrates how sex fantasies exert a more powerful influence on our emotions, behavior, and relationships than we ever imagined.

Close to 50% of U.S. women have experienced an unplanned pregnancy and more than 1/3 will have had an abortion by the age 45.
Alan Guttmacher Institute
Discovery Series: Introduction to Human Sexuality
Sexuality Now: Embracing Diversity, 4th edition
The Day Aunt Flo Comes to Visit: An Honest Conversation About Getting Your Period.
For Better: The Science of a Good Marriage
Who’s Been Sleeping in Your Head: The Secret World of Sexual Fantasies
Unhooked: How Young Women Pursue Sex, Delay Love and Lose at Both