A common schoolyard joke, where a kid will ask you which number is your favorite. If you say 8, you're a lesbian (two vaginas), if you say 10, you're straight (a dick and a vagina), and if you say 11, you're gay (two dicks). Personally, this is an offending joke that makes fun of sexualities as wholes. You shouldn't hate gays, or you hate 1/10 of all humans on Earth with meeting most of them.
Some annoying kid ask ed me 8, 10, or 11, but since there's no number that represents bi, I just said I couldn't decide between 10 and 11 :>