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By Sally Law, LiveScience’s Science of Sex Columnist

As 2009 comes to a close, LiveScience looks back at the year’s nine most intriguing sex lessons. We’ve loved. We’ve learned. And we’ve had some of our sexual suspicions confirmed by scientific research.

Pulling out works:

Well, most of the time. In a paper published in the June issue of Conception magazine, researchers claimed that withdrawal was "almost as effective as the male condom" when it came to pregnancy prevention

Growing pains:

According to a study from the University of Turin, penis extenders might work  — a particular brand that used traction to gradually stretch the penis over time was found to increase flaccid members’ length by almost one inch.

Pill popping:

In February, the Federal Drug Administration mandated that Bayer, the manufacturer of Yaz birth-control pills, fix their commercials that promoted Yaz as a weapon against acne and PMS and downplayed its potential health risks.

The pursuit of pleasure:

Men who are very sexually active in their 20s and 30s — especially those who masturbate frequently — are at higher risk for prostate cancer , said researchers at the University of Nottingham. But that risk decreases as a man ages, and once he’s in his 50s, even small levels of sexual activity can help protect him from the disease.

This is a test:

The American College of Obstetricians and Gynecologists released new guidelines for cervical-cancer screenings: Women should wait until age 21 to get their first Pap smear, and should be checked every three years (instead of annually) if they have a history of normal test results.

Sweat smells:

A man’s sweat smells different when he’s sexually aroused - and women can tell the difference between the smell of sexual sweat and the regular stuff, according to a study in The Journal of Neuroscience.

Researchers found that ’superwoman work-outs’ made fertility problems three times more likely.Spending too much time in the gym can reduce a woman’s chances of having children, a study shows.The findings were made by Norwegian University of Science and Technology after a study of 3,000 women.While experts agree that a certain amount of physical exercise has obvious health benefits, it is believed that too much saps the body of the energy it needs for a successful pregnancy.

In a survey, the women were questioned about the frequency, duration and intensity of their fitness regimes between 1984 and 1986.In a follow-up ten years later, they were asked about their pregnancies.There were those who trained almost every day, and there were those who trained until they were completely exhausted.’Sigridur Lara Gudmundsdottir, who led the study, said: ‘Among all these women, we found two groups who experienced an increased risk of infertility.

Those who did both had the highest risk of infertility.’Even after taking other factors such as age, weight, marital status and smoking into account, figures showed those who trained the hardest were three times more likely to have fertility problems than those who exercised moderately.

Younger women appeared to be more vulnerable to the risk. Among the under-30s who exercised the most, a quarter were unable to conceive during their first year of trying, compared to the national average of roughly seven per cent.It was not known whether this was because the women had simply changed their activity levels or because their hormone profile improved with time.

There was no evidence of impaired fertility through moderate amounts of exercise.Gudmundsdottir advised that women who want babies should still maintain their fitness - but ‘ease off a bit’ and avoid extremes.We believe it is likely that physical activity at a very high or very low level has a negative effect on fertility, while moderate activity is beneficial,’ she said.

(Re edited by Tim)
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