A millennium-old Japanese medical scroll says you can live longer if you have sex more often, while only finishing a fraction of the time (for the men, anyway). The Ishinhō, preserved in the imperial archives, is 30 scrolls long, but Scroll 28 is the one with instructions that still raise eyebrows: keep your life force intact, limit how often you finish, and use sex to stay alive.

The focus is on jingqi, a form of vital energy thought to drive every system in the body. The scroll warns that spending it too freely accelerates aging. Its prescription is blunt: men should ejaculate only two or three times for every ten sexual encounters, letting the rest of that energy circulate instead of losing it.

Leslie Kenny, founder of Oxford Healthspan, told the New York Post the ancients may have be

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