I’ve barely got my coat off before Betty Dodson, the New York sex educator, sets precisely the frank, ribald tone she has become renowned for. Dodson is 90, but has, I tell her truthfully, the skin of a woman at least 30 years younger. “Well,” she declares, matter-of-factly, “I smoke and I drink and I masturbate. I’m a hopeless masturbator.

“Nobody factors in pleasure for health,” she continues. “But if you’re not having fun, you’re not going to be healthy.” Quite.

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