Some say Bisexuality is a myth embraced by homosexuals who haven’t fully accepted their orientation. I’m not so sure. It appears that there are some people who are sexually attracted to members of both sexes. There are also some people who engage in sexual activity without a particular attraction to their partner. Hedonistic sexual activity doesn’t necessarily require sexual attraction. Maybe Elton John is a homosexual who also engages in hedonistic behavior? We’d need an objective, consistent, and reliable test to find out.
Homosexuals died of AIDS in droves in the 80's because they engaged in risky behavior and LOTS of it. It was a choice. And still is today. Face it. It's a behavior, not a genetic trait.
All behavior is choice, but homosexual attraction objectively exists. There exist a significant number of people who are sexually attracted to members of their own sex and not to members of the opposite sex. Is it genetic, developmental, or a combination of both? I don’t know, but I try and follow the research. Homosexuals may act on their impulses or they may choose not to. They may marry and bear children. None of this changes the fact that they are homosexual.