Being gay is a choice, none of them were born lesbian.
A lot were indeed abused and to touch on what DLB said earlier, some alpha(s) shit on their soul and they are no longer interested in men because of that.
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TYSON the reason they don't watch lesbian porn is because it's designed to stimulate straight men, not lesbian women. I mean think about it, lesbian porn is considered 'straight' because it is to straight males and are in straight searches. Most lesbians aren't turned on by lesbian porn because of that. Gay porn is different. Gay porn is not designed for straight men, it's geared towards gay men. So I guess it arouses them more because it's done how lesbian porn for lesbians should be done.