I don't think homosexuality is a lifestyle, it's simply a sexual preference. I don't think it's something they choose to be or choose to live by.
I don't think you're born with it either, I may be wrong though. I believe that preferences of any kind develop in early childhood.
Some people like tall girls, others like strong men. I actually find it bizarre to label sexual preference. We don't label men who love blond women or women who like skinny men.
If we believe that sexual preference is innate, then all our preferences are innate and could be passed on.
I believe that our preferences are formed early in our lives by experience.