In rare cases, menstrual cramps have been known to bring about orgasm.
The amount of wet dreams a man is likely to have increases in line with the number of years spent in formal education.
Compared to anywhere else, adults are more likely to tell a lie in bed.
The majority of women prefer to have sex in the dark.
When having sex, black women are 50% more likely to reach orgasm than white women.
60% of non-smoking women have had no sexual partners in the past year, while 70% of women who smoke have had more than four lovers over the same timescale.
Women who are prone to migraines tend to have a higher sex drive than those who are not.
Thirty four per cent of men have told lies in order to have sex. Ten per cent of women have done the same.
More than 50% of all cheating wives choose married men as their lovers.
About 1% of women can achieve orgasm solely through breast stimulation.
Within the week, 22% of women tell at least five friends about their first sexual experience with a partner.
70% of men and women admit to having fantasised about someone else while having sex.
Two thirds of runners admit to having thought about sex while running.
