@Ononoke:
IMO, the moment a genuine straight guy puts and pleasures his dick inside another man's hole and enjoying it, and/or lets another guy uses his hole for sexual pleasure and enjoying it… he can longer be called straight. Sure, he might still identify himself as one afterwards, but technically and logically he's already a bisexual.
So I guess every man who gets married because he's too afraid to come out of the closet when he's young, has kids, but then when he's older finally admits he's gay and leaves his wife is actually bisexual because he's had sex with a woman?
Experience doesn't dictate sexuality, attraction does.