Lesbian Multiplication

Listen up, buttercup! The joke is that "lesbians" can't "multiply". It's a play on words, see? Because, uh, lesbians, well, they are a gender thingy, and multiplication is, like, when numbers get bigger... You know, the joke is based on the stereotype that lesbians are bad at math and can't 'multiply' in the same way a straight couple can.