I think that guys who consider themselves as straight, whether they occasionally have sex with men or not, are what I would call straight.  I think it's up to individuals to define their own sexuality, or not, as they prefer.
I put straight in the title as I get why gay/bi guys would want to have sex with another man.  I don't get what straight, mainly straight, predominantly straight, straight-ish guys etc, whatever you want to call them, get from the experience.
And also cos I find straight-ish guys horny and want to hear from them...
