American Pie 2: The rule of three.

I don't think it's much of a surprise, but research has demonstrated that men over-report number of sexual partners and women under-report. This is directly related to the double standard: men are praised for their sexual conquests, and women are judged negatively. The following clip from American Pie 2 plays on this theme. NSFW language:

American Pie 2 movie clips: http://j.mp/1JctIaJ BUY THE MOVIE: http://amzn.to/tIP7Rw Don't miss the HOTTEST NEW TRAILERS: http://bit.ly/1u2y6pr CLIP DESCRIPTION: The men and women separately talk about the rule of three and how you can figure out how many people someone has slept with.