In Focus:

Post-Orgasm Illness Could Be Caused by Semen Allergy

A mysterious flu-like sickness that affects some men after they've had an orgasm is exceedingly rare, but scientists warn its prevalence may be greater than we know due to under-diagnosing of the illness.

The condition – called Post-Orgasmic Illness Syndrome (POIS) – was only first reported in 2002, but since then some 50 cases have been documented, in which men experience a range of flu-like and allergic symptoms after ejaculation.

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