Like in any sexual harrassment case the best thing to do is tell the offender first and if they continue then you should report them to their supervisor and yours. The bad thing about reporting such behavior of a gay person is that you could recieve some back lash from this. The reason being is that in today's society you could be pegged as a homophobe or some other Liberal garbage like that. The best thing to do when reporting them is to not to ever mention "gay" at all. That way the offender, nor anyone else, can play the homophobe card. Sure, it'll be obvious the guy is gay since he is hitting on another man but it's just better not to bring up the fact that he is gay.