Really? Let's start with the obvious. Why the hell would someone choose something that is so difficult to live with, for multiple reasons?
Do you personally find men as attractive as women and feel you could go either way? I don't know about you but no matter how good looking a guy is I don't ever feel like having sex with him. Maybe you're different in this regard. And that's fine.
Maybe you live a sheltered life but I happen to know of several guys who were obviously gay when they were very young. My daughter and her friends have at least two guy friends that have hung out with them since they were little and it was obvious from a an early age that they were gay. They fit in very well with the girls. One of them actually fought it for a time since he did not want to disappoint his parents.
My brother is gay, and he certainly did not choose to be. I asked him point blank about this and again, he said from a very early age he was attracted to guys. The conflict this caused him made a bit of a bully for a time in Jr High.
Do you think the mannerisms and speech of some gays is just an act? Or a learned behavior?
Finally, there are MANY scientific studies showing physiological differences between gays and straights that can only occur if they are born that way.
Here's some of them. The first one is perhaps the best.
Birth order[edit]
Main article: Fraternal birth order and sexual orientation
Blanchard and Klassen (1997) reported that each additional older brother increases the odds of a man being gay by 33%.[24][25] This is now "one of the most reliable epidemiological variables ever identified in the study of sexual orientation."[26] To explain this finding, it has been proposed that male fetuses provoke a maternal immune reaction that becomes stronger with each successive male fetus.
(Note: this effect is also observed in brothers that are raised apart, so it is not due to having an older brother around)
Gay men and straight women have, on average, equally proportioned brain hemispheres. Lesbian women and straight men have, on average, slightly larger right brain hemispheres.[55]
The VIP SCN nucleus of the hypothalamus is larger in men than in women, and larger in gay men than in heterosexual men.[56]
Gay men report, on an average, slightly longer and thicker penises than non-gay men.[57]
The average size of the INAH-3 in the brains of gay men is approximately the same size as INAH 3 in women, which is significantly smaller, and the cells more densely packed, than in heterosexual men's brains.[34]
The anterior commissure is larger in women than men and was reported to be larger in gay men than in non-gay men,[33] but a subsequent study found no such difference.[58]
Gay men's brains respond differently to fluoxetine, a selective serotonin reuptake inhibitor.[59]
The functioning of the inner ear and the central auditory system in lesbians and bisexual women are more like the functional properties found in men than in non-gay women (the researchers argued this finding was consistent with the prenatal hormonal theory of sexual orientation).[60]
The suprachiasmatic nucleus was found by Swaab and Hopffman to be larger in gay men than in non-gay men,[61] the suprachiasmatic nucleus is also known to be larger in men than in women.[62]
The startle response (eyeblink following a loud sound) is similarly masculinized in lesbians and bisexual women.[63]
Gay and non-gay people's brains respond differently to two putative sex pheromones (AND, found in male armpit secretions, and EST, found in female urine).[30][64][65]
The amygdala, a region of the brain, is more active in gay men than non-gay men when exposed to sexually arousing material.[66]
Finger length ratios between the index and ring fingers may be different between non-gay and lesbian women.[60][67][68][69][70][71]
Gay men and lesbians are significantly more likely to be left-handed or ambidextrous than non-gay men and women;[72][73][74] Simon LeVay argues that because "[h]and preference is observable before birth...[75] [t]he observation of increased non-right-handness in gay people is therefore consistent with the idea that sexual orientation is influenced by prenatal processes," perhaps heredity.[34]
A study of over 50 gay men found that about around 23% had counterclockwise hair whorl, as opposed to 8% in the general population. This may correlate with left-handedness.[76]
Gay men have increased ridge density in the fingerprints on their left thumbs and pinkies.[76]
Length of limbs and hands of gay men is smaller compared to height than the general population, but only among white men.[76]
http://en.wikipedia.org/wiki/Biology_and_sexual_orientation.
So common sense, observation of people and science all point to the fact that being gay is not generally a choice.
All this being said, there are some bisexually attracted people that will choose homosexuality but they are a small minority.
