#9: THREESOME (1994)

Sexual Arrangement: Three college roommates (two guys and a girl) agree to have three-way sex.

When ambiguously named Sam (Lara Flynn Boyle) is mistakenly placed with male college roommates Eddy (Josh Charles) and Stuart (Stephen Baldwin), the trio becomes entangled in a love triangle. Sam falls for Eddy, who's totally gay for Stuart, who lusts after Sam, and eventually they get over their inhibitions and agree to an all-roommates-can-participate sex-fest. Not the hot-dog-to-bun ratio we look for in a threesome, but hey, college is a learning experience.