"Today's first base is kissing ... plus fondling this and that. Second base is oral sex. Third base is going all the way. Home plate is learning each other's names."
So wrote Tom Wolfe in his 2000 book "Hooking Up" -- a term that describes a wide range of coupling from making out to intercourse.
For more than a decade, the "hookup" has been an integral part of the American college experience -- a result of the increased permissiveness that came with the sexual revolution of the 1970s.