I can see that it would be easier for a man to get from a man, but its still a risk for a hetero person having sex with any infected person. I read somewhere that an HIV positive person can actually reinfect himself, meaning he may have a less nasty strain that the next guy, but if he has a "wtf I'm going to go hog wild" mentality thinking he and any other HIV guy are safe to party on, they may swap their strains and make a stronger virus than they previously had...It may be untrue but its a sobering thought.