A lot of guys test for HIV and other sexually transmitted infections (STIs) every six months as a way of staying healthy and taking care of the gay community.
STIs don't always have symptoms which means that you could have, and spread, gonorrhea or syphilis without knowing it. That's not all--just because an STI isn't bothering you doesn't mean it's not causing you damage. Take HIV for example, you could be symptom free for years, but it will eventually cause you huge problems...
HIV/AIDS still has no cure.
Fortunately most sexually transmitted infections aren't as serious as HIV. Most STIs can be cured or effectively managed--but that means going into a clinic to get checked out regularly.
If you're having sex, make testing twice a year a part of your routine.