It's definitely a lifestyle, and one that can be changed. Many folks will state sexuality is fluid, and it is, but some of those folks only believe sexuality flows in one direction: from heterosexual to homosexual.
In reality, it flows both directions: People can change.
I Do Exist
Testimonials of former homosexuals
You'd get a real argument from my husband. He's a psychiatrist who has studied and treated homosexuals for over 30 years. Genetics play a part, in males for sure, altho SOME are bisexual.