Who's Afraid of Virginia Woolf? Sex Quotes

How we cite our quotes: Citations follow this format: (Act.Line). Every time a character talks counts as one line, even if what they say turns into a long monologue.

Quote #10

George: You don't make it in the sack, you're a houseboy. […]
Nick: Tell him I'm not a houseboy.
Martha: No; you're not a houseboy. (3.157-3.159)

Martha is lying to her husband in code, saying that she did indeed sleep with Nick. Is her motivation simply to hurt him? What other levels of sexual warfare are going on here?