I have a friend who suspects he may be bisexual, but then again he questions it. I tell him the only way he will be able to determine what he is, is by being somewhat intimate with a man...maybe a good friend..something. Anyway, if he enjoys it and is aroused then he's probably bi..if it grosses him out then he's straight...right? I don't know, if I personally doubted my sexuality in this way I'd have to find out some how..it would bother me.