Levin ran a small investigation that focused on the erotic sensitivity of the female urethra. More specifically, his interest was in the toenail-sized patch of tissue that surrounds the outlet of the urethra: the periurethral glans. In men, this glans, which lies at the tip of the penis, is exquisitely erogenous. Levin has observed that when women have intercourse, the female glans, as he calls it, is repeatedly pulled partway inside the vagina—as much as half of it typically disappears into the crevasse with each thrust. Perhaps women who have orgasms during intercourse, he reasoned, are
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