Because it's like I said, in the DNA strands. I also didn't say behavior couldn't change, I said it gave you a sense of how you think you should from the start. However, you can't change who you're attracted to or how you feel about yourself though, no matter how hard you try. you may not look that way on the outside, but the deeper stuff on the inside shows different.
it doesn't control your thoughts, but it develops the brain and so it controls your base thoughts and topics. as it develops it gives you a sense of how you behave ultimately.
this includes who you are sexually attracted to and who you feel you are. what are your opinions after hearing this?