There’s a myth that many young men in Japan are familiar with: the physical exertion involved in one ejaculation is the same as running 100 metres as fast as you can. Now, although many such claims often carry about as much scientific weight as the idea that dropping a cold key down someone’s back can cure the hiccups, as any men will tell you, there’s a reason why we often feel the need to collapse and fall asleep after a particularly vigorous session.

Nonsense or not, this particular myth is one that has existed for generations in Japan and refuses to die off, being passed from one huddle of teenage boys or young office workers to the next. For this reason, online magazine R25 turned to a medical professional to get the cold, hard facts.

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