It's a nightmare scenario for most guys to even imagine, but for a handful of men across the world that are ALLERGIC TO THEIR OWN SEMEN, it's a crippling reality.

Immediately after ejaculating, these men experience flu-like symptoms including a fever, runny nose, apathy, joint stiffness, and loss of short-term memory. Researchers have dubbed it "post-orgasmic illness syndrome" (POIS), and it's as horrible as it sounds.