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The Myth: Feeling a tingle down there means you're into what's happening (on some level).

The Truth: Blood flow to your private parts increases when you're exposed to sexual stimulation, even if you don't like. The scientific term for that is arousal non-concordance. "All it means is that there's something sexually relevant happening," says Nagoski.

Translation: You could literally be watching a video of monkeys having sex and start to feel some action happening below the belt. (Yes, researchers have actually tested this in a lab.) This is particularly important for survivors of sexual assault who might have felt some degree of sexual response during the attack, because it's essentially a reflex that you can't control, says Nagoski.