Wow I missed quite a debate last night. I voted "Predominantly homosexual, only incidentally heterosexual" if anyone didn't understand yet.
Generally I'm not interested in girls sexually, at all. Quite frankly I find the idea of tits repulsive. However when I have been quite wasted have snuggled and kissed with couple of girls. For me it's not much of a problem if it happens I guess; a guy + a girl is nothing the society hasn't seen before. So generally I'm gay, but there have been incidents in my life that are of heterosexual background.
I've heard of studies, but I'm too lazy to look for them atm, that some 1/3-1/2 of american males have had same sexual encounters; mostly in their teens or college years.
And no TDE, I didn't have to pull my cock out and yank it to the girls to know that I don't have an issue with nudity and I don't link it to sexuality. Men constantly expose themselves to each other in the changing rooms of gyms; other sporting centres; saunas etc. There's a nice tradition of going to finnish saunas in Estonia. It's common to be naked there at 100 degrees Celsius. In mixed saunas (men and women) it's still very much the same. If I get naked in front of a naked girl I'm not like "oh yeah that's the reason I'm gay".