Saying no when meaning yes undermines date-rape consent defenses

Evidence

A second part of the traditional sexual game holds that a woman should not easily agree to sexual intercourse when she is willing. To do so could mark her as a “tramp” in her own mind, and in the opinion of the man busily trying (he thinks) to seduce her. So women might feel pressured to say “No” for a while when they are agreeable to sex, even though this undermines the “No means No!” defense against date rape. — Bob Altemeyer, The Authoritarian Specter, 2396