As far as I know the following hypothetical experiment is mine. The assine braintrusts at Stanford and Oxford and such are too busy playing with rats. Maybe Cosmopolitan has done this, eh?
Let's say there is a group of a 100 people, 50 men and 50 women. All single and all relatively "normal". OK, don't get crazy with me on this..."normal" men and women, kinda randomly chosen.
They meet once a week, in a social gathering for an hour or two.
At the end of, say, 3 months, how many (would you guess) of these men and women are now having sex?