So, if you were to ask me, an untrustworthy bisexual man, whether I was gay, I would say "no". Equally, if you were to ask me if I was straight, I would also say "no". This is because bi people are neither of these things. Actually, if you were to approach me and question me about my orientation, I'd be much more likely to say "BEGONE FROM MY SIGHT, FOUL CREATURE, BEFORE I RELEASE THE PANTHER" and then relase the panther anyway.
More (with very strong language) to be found http://withiel.livejournal.com/10796.html