Looking for a joke posted on PF!

[Mk]

Hey! There was a long math joke posted on PF.... I read it before, I think it was in the science jokes thread perhaps. It was a story about a schoolgirl having sex, but it used unrelated mathematical terminology and was very funny. :) Any help?

[mattmns]

I think I know what you are talking about, but I can't seem to find it.