I find the whole "your environment influences your sexuality" thing total bs.
When I was a girl I was openly homosexual. But, I was raised in a God fearing, bible thumping, straight home. If environment influences your sexuality then I would be straight. Along with all of my other gay or bi friends. Because our environment was against homosexuality.
Just like, if you're raised in a home where say your parents are gay, that won't influence your sexuality. It will simple open your mind to more then just "girls must be with guys".
And further more, sexuality is NOT a choice in any way what so ever. You can not choose to be attracted to the same sex just like you can't choose to be attracted to the opposite sex. Again, total BS.