My point is that there is no such thing as the heterosexual lifestyle, or homosexual, or bisexual.
Each group is made up of people leading totally different and unrelated lifestyles. There isn't enough in common between them to warrant labelling it a "lifestyle"
You might as well label me as leading a "bacon eaters' lifestyle". Sure, I eat bacon, but I have nothing obvious in common with other people who do. It doesn't make sense to just slap a "lifestyle" behind a random word and expect it to make sense.
What's wrong with bacon eater's lifestyle? If you eat bacon regularly, and so do other people, I don't see the problem with calling it a lifestyle.
What you seem to think is that it isn't correct because the descriptor covers a wide and diverse population of people. What you don't seem to get is, of course it does. With only one thing being described as a "lifestyle" at a time, it's going to cover a lot of people, since a lot of people will do this one action, or have this one interest, regularly. And there's nothing wrong with that. If you eat bacon regularly (I have no doubt you do), then there's nothing wrong with calling what you're doing a "bacon eater's lifestyle". And since that lifestyle is only concerned with bacon, of course you're going to get a wide population of people, very different from you. But, you all share one element in common, and that is you eat bacon regularly, and hence live the "lifestyle".