Sex isn't exactly scientific. But that hasn't stopped sexologists--people who study sex--from making it a science. And you'd be surprised at how their ideas inform popular psychology.
We use words like "anal retentive" and "nymphomaniac" at the drop of a hat, but do we really know what they mean?
Take this eighth in our sex quiz series and see how much you know about the science of sex.
Also, check out our other sex quizzes:
birth control
lingo
boys
gender
sexually transmitted infections
aphrodisiacs
