[Emu]

I forget the specifics, and I can't remember what they're called, and all of my school notes are 1200 miles away right now.

But they have a genetic or prenatal condition in which the subject (say, a male) is so straight the thought of other men -- other men PERIOD, not sexual activity -- makes them violently ill and nervous. This is not to be confused with homophobia, which is more the consequence of society than biology. My teacher met a man with this condition who was doing research on it and was giving a speech at a local college, and when he approached the man after the speech, the man kept backing away and got really nervous about talking to another man.