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However, this study suggests that some of those same forces of nature may also affect the sexual behavior of men and women.

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" The study involved 68 sexually active women who kept a diary of sexual intercourse and provided daily urine samples for three months.

All of the women were using an intrauterine device or had had a tubal ligation to protect against pregnancy.

Previous research has shown that the five days leading up to ovulation and the day of ovulation are the days in a woman's menstrual cycle when she is most fertile.

Increasing the frequency of sexual intercourse during these days increases the chance of pregnancy.

Researchers say that in mammals, this fertile period is often coordinated with intercourse through fluctuations in libido, and in some animals, ovulation is happens as a result of intercourse.

But neither of these biological mechanisms has been established in humans.