A sexually transmitted disease contracted by those whose sexual arousal has taken over their nerve cells, therefore forgetting to use a condom. And since nowadays according to close-minded non-intellectuals, (which make up about 63% of the population) being a virgin makes you a "loser", we have people with Herpes lying around all over the place. Just remember everyone: No glove, no love.
Person 1: I have genital herpes!
Person 2: ... Congratulations.