Sexual mishaps are an unfortunate, and often hilarious, side effect of sex. Of all the things that could go wrong, my least favorite is that awkward moment when your partner's awesome gushing orgasm turns into a searing pain in your eye. It happens to the best of us, but in the moment, there is nothing worse. So, the question is, why does semen burn your eye and how can you stop the burn? The answer is simple, but to understand you have to know what semen is made of.