“I’m allergic to other people” sounds rather like the kind of thing you’d find printed on a novelty tee – but for some people out there, it’s an all-too-real diagnosis. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

“You can be allergic to pretty much anything,” one doctor told Vice back in 2015. And yes: that includes humans – or at least enough bits of them as to make life really difficult.

Semen allergies

Some people want sex but can’t get it . Others don’t want it at all. But pity the poor folks who want sex, get it, and then immediately almost die because of it.

“One night […] we were lying in bed after sex and my tongue suddenly began to swell,” one woman told BBC Future earlier this year. “My partner saw what was happ

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