Some Will Knock You Out; Others Will Just Chill You Out

Illustration: Jen Troyer

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Some Will Knock You Out; Others Will Just Chill You Out
Research has shown that orgasms experienced during sex cause us to release 400 times more prolactin—which tends to make people feel sleepy and satiated—than from those from masturbation, writes Meston in Why Women Have Sex, a book she co-authored with the psychologist David M. Buss. This is why women may still feel alert enough to write a status report or clean the bathroom mirrors after a self-induced pleasure session. It all makes evolutionary sense, say the authors, because post-sex sleepiness helps women lie still, which is the optimal position for conception.
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