statistics on who is and who is not gay are highly unreliable, since surveys regarding sex and sexuality are highly unreliable. some people might be living as a straight person, but in a different world, under different circumstance, they'd have been gay.
they've hit on me in bars and online. i feel for them, i do, but i'm not going to help someone cheat on their spouse. and, if asked, i'm sure they'd answer "straight" to some sort of survey.
the ability to even identify as gay is contingent, to some degree, on variables such as ethnicity and socio-economic status. the stereotype of gay men being rich, white, and urban is partly due to the fact that it is easiest for white men with some kind of financial independence to actually come out and be able to survive the possible consequences -- abandonment by family, ostricization by the community -- that are often suffered by gay men.
my experience has show me this.
there are significantly more gay men than lesbians. i've heard estimates of almost a 2-to-1 ratio. my guess is that this has to do with gender differences where physicality plays a much stronger part in sexual attraction for men than it does for women (a generalization, i know).
however, the amount of women who claim some sort of bisexual attraction is probably higher than the percentage of gay men. for whatever reason, i've known many women who have had a same-sex fling, admit to sexual girl-crushes, who occasionally fantasize about other women, but they all have wound up with men.
generally, men don't do this.
the reaction a straight man is going to have at the thought of performing oral sex on another man is roughly analgous to the reaction a gay man is going to have at the thought of performing oral sex on a woman.