Dude?

Men with the condition, known as post orgasmic illness syndrome or POIS and documented in medical journals since 2002, get flu-like symptoms such as feverishness, runny nose, extreme fatigue and burning eyes immediately after they ejaculate. Symptoms can last for up to week.

Marcel Waldinger, a professor of sexual psychopharmacology at Utrecht University in the Netherlands, published two studies which suggest that men with POIS have an allergy to their own semen, and that a treatment known as hyposensitisation therapy can help reduce its impact.