Male bisexuality is a difficult thing to define. Our guys will do things like DP, sloppy seconds, go down on us after the other guy has ejaculated inside, one kiss a woman while the other fucks her, etc. There are perhaps homosexual aspects to it, but they never do full-on oral or anal gay acts, the exact things that they do with women. They really believe that it isn't gay if there is a woman involved. Or it's more that guys want to get off in a woman and will tolerate just about anything that gets them there. That seems to be the real dividing line.