Very often, a seemingly mild case of onesack can develop into a more chronic, and sometimes even lifetime condition. The only cure for that strain of onesack is death - yours or his. Do you want to live with a debilitating illness??? God no!
Better to be single and go around fucking all the randoms you secretly wish you were fucking, and not allow this sneaky opportunistic illness take hold and ruin your life.
Unfortunately there is no way to vaccinate for onesack at the moment, although many of the world's greatest thinkers and visionaries are working on the problem as we speak - their greatest efforts so far concentrated on fizzy sweet alcohol drinks like Bacardi Breezers, otherwise known as "Leg-Openers", and guaranteed to put an illicit sexual event with a questionable whore on your calendar.
All I can say in warning, is be ever vigilant to the symptoms of onegina, which are enumerated as follows:
1. An amazingly huge amount of dry vagina thoughts and deeds
2. A constant look of contempt on your friends' faces when they talk to you
3. An appreciation for gay shit like "going out for dinner" or "taking in a movie" or at its worst, "a quiet one at home with the daddy"