http://www.plannedparenthood.org/sexual-health/std/preventing-stis-stds.htmThree Steps to Safer Sex
Become honest with ourselves about the risks we take.
Decide which risks we are willing to take — and which ones we aren't willing to take.
Find ways to make our sex play as safe and satisfying as possible.
The most important ways to reduce your risk are
Keep your partner's body fluids out of your body — vagina, anus, or mouth. The body — fluids to be most careful about are blood, cum, pre-cum, vaginal fluids, and the discharge from sores caused by sexually transmitted infections.
Don't touch sores or growths that are caused by sexually transmitted infections.
Safer sex also means protecting your partner.
Don't allow your body fluids to get into your partner's body.
Don't have sex if you have sores or other symptoms of infection.
Have routine checkups for infections.
Get the correct treatment if you become infected.