Are you gay or bisexual?
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This started as a comment on a post of Wired Nerve's. It got too fat so I made it an entry. It is pretty hasty and wandering.
Many people are more able to perform sex acts with the sex they aren't ordinarily attracted to. Back when I was in the business there were guys who were able to have an orgasm when a guy gave them a blowjob. But they would've never gone with a man without personal economics pulling them. Similarly men in prison have sex with men rather than their hand. This is at least functional bisexuality. (And leads to far too many bypaths into the individuals' sexuality for me to try to pursue in a comment.)
I've known plenty of gay men who've had climaxes with women without any desire to ever do so again. It was just a triumph of friction. Masturbation requiring more effort.
A woman who has sex with another female to please a boyfriend are on some level bisexual, if only functionally. It is easy to cavil at this but some people can only enjoy sex with a fetish object. So a man's approval might function as a catalyst to create a sexual potential that wouldn't exist otherwise.
The man in prison who finds a guy to be his 'bitch' puzzles me. What is he getting out of this if he just wants an orgasm? His sexuality may as much defined by a hunger for submission or control as ejecting his sperm. And will use any object available. His inability act bisexually out of jail may be weakness: fear of looking gay.
Some people are bisexual in the sense that they can enjoy having sex with either gender. But some (only heterosexual?) bisexuals want a role and life that can only be achieved with a partner of the opposite sex. Some weaklings need the acceptance of family and coworkers. Others want children produced by natural means.
Some people are happy to have sex with men and women. Some aspect of upbringing left them able to love only one sex. They can get hot and bothered when they see a nice looking man or woman but get a little giddier when they see someone of the sex that matters most to them. A boy or girl makes them smile more.