When I heard Anita Hill say "penis" on national TV, I told everyone in the room that within a week, comics on TV would be using the word. It took about 24 hours, and it was all over the place, and has been ever since. Based on watching about five episodes in the last five years, I'll bet there hasn't been one episode of "Friends" without the word "penis"--and there are probably a bunch of other sitcoms that have never left it out of a single episode.