I was talking with some of gay friends about this. Its when two men rub their dicks against each other and come, instead of having anal penetration.
People who like frottage say that it's less likely to lead to HIV transmission, but one could still get genital warts from it. Even still i don't get some of the frottage arguments, like saying anal sex is not pleasurable and that it's degrading to the bottom. Can't the bottom get a prostate orgasm from anal sex? do many bottoms actually feel degraded at being penetrated? hIV is a valid point i guess, but I reckon it's a person's right to engage in risky behavior, as long as they can accept the consequences of their actions and not hurt anybody else.
so, if any gay guys are here, what say you about frottage?