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Unprotected Sex Around Ovulation Increases Chance of Pregnancy

Your parents or sex education teacher may have told you that it only takes a single act of unprotected sex to make a baby, but new research suggests it may be much more likely than they thought.

A new study shows that sexual activity tends to peak during a woman’s most fertile time, which means the chances of becoming pregnant from a single unprotected sex act are higher.

In the study, researchers examined patterns of sexual activity in relationship to ovulation. They found that sex was 24% more frequent during the most fertile days of the women’s monthly cycle.

“There apparently are biological factors promoting intercourse during a woman’s six fertile days, whether she wants a baby or not,” says researcher Allen Wilcox of the National Institute of Environmental Health Sciences in Durham, N.C., in a news release.

“It’s not uncommon for a doctor to hear from an unhappily pregnant patient that she and her partner had taken a chance ‘just this once,’” says Wilcox. “It may be easy to dismiss such claims, but our data suggest these women are probably telling the truth.”

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(Atlanta) — Women who are nervous, tense, or suffering from PMS might want to try snuggling up to a man — preferably one who is hairy and hasn’t showered recently. A new study indicates that women who sniff a chemical found in male skin and body hair can reduce nervousness, tension, and other negative feelings.

The study, published in a recent issue of Pschoneuroendocrinology, appears to confirm the existence of a chemical found on human skin that can change the mood and behavior of other people. And the chemical gains access to the brain through an organ previously believed to serve no function, according to the study’s authors.

This type of chemical, known as a pheromone, is known to be important in the animal kingdom and is responsible for many aspects of animal sexual behavior. The finding that these chemicals also work in humans may lead to new drugs and a new type of drug-delivery system. In the meantime, it has led to a new drug company.

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Sexual Orientation May Affect Brain Response to Human Pheromones

WebMD Medical News
By Miranda Hitti
Reviewed by Louise Chang, MD

Lesbian women and heterosexual women respond differently to the scent of human pheromones, a new study shows.

Pheromones are chemicals known to drive one or more behavioral responses in animals, including sexual behavior.

The new study comes from Ivanka Savic, MD, PhD, and colleagues. They work at the Karolinska Institute in Stockholm, Sweden.

The researchers studied brain scans of lesbian women, heterosexual women, and heterosexual men while those people smelled scents including two potential human pheromones.

Brain scans taken while smelling those pheromones were more similar for lesbian women and heterosexual men than for lesbian women and heterosexual women, the researchers report. Their study appears in the online early edition of Proceedings of the National Academy of Sciences.

Last year, Savic’s team published a study showing that homosexual men and heterosexual women had similar brain activity patterns when smelling those same human pheromone candidates.

Sexual preference may sway the brain’s response to the pheromones, the researchers note.

Pheromone Study
Savic’s team studied two candidate compounds for human pheromones. Those potential pheromones are called “AND” and “EST.”

AND is found in human sweat. The concentration of AND in men’s sweat is about 10 times greater than in women’s sweat, Savic’s team notes.

The researchers describe EST as “an estrogen-like steroid.”

Savic’s latest study included 12 heterosexual men, 12 lesbian women, and 12 heterosexual women. All were healthy and not taking medication.

The lesbian women had normal hormonal levels. Regardless of sexual orientation, the women were studied at the same point in their menstrual cycle.

Sniffing Scents
Participants were given glass bottles containing scents including AND, EST, lavender oil, or cedar oil. Each bottle only contained one scent.

Meanwhile, the researchers scanned participants’ brains with magnetic resonance imaging (MRI) and positron emission tomography (PET) technology. Afterward, participants rated the scents for pleasantness, irritability, intensity, and familiarity.

Lesbian and heterosexual women showed different patterns of brain activity while sniffing AND and EST, the study shows.

While smelling AND and EST, the brain activity pattern for lesbian women was closer to that of heterosexual men than heterosexual women, Savic and colleagues note.

However, the previously reported similarities between brain activity for heterosexual women and homosexual men while sniffing the pheromones were stronger than those between lesbian women and heterosexual men.

The pheromones didn’t necessarily have a sexy smell. “None of our subjects reported sexual arousal” while whiffing any of the scents, the researchers write.

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