High School Sex Map
“A study of sexual and romantic relations at a high school found students connected by long chains, rather than in a tight network with a core group of a promiscuous few. Sharing of partners was rare, but many students were indirectly linked through one partner to another and another. The unexpected result could help shape strategies for combating sexually transmitted diseases among young people… In the most striking chain, 52 percent of the romantically involved students were connected in a manner of student A having relations with B, and B having relations with C, and so on down the line over the 18 months of the study… The research reveals a semantically complex rule that seems to guide adolescent sexual conduct. Here goes: A girl is loath to date her old boyfriend’s new girlfriend’s old boyfriend.”
~ LiveScience.com (US)

Imagine you had a map like this for your sex life, and those dots had names. Would you really want to know?