Simple. I see many beautiful women walking around and also in the media. I have NEVER been attracted to any of them. In fact, the idea of kissing or having sex with a genetic woman no matter how beautiful, smart, confident, accomplished, kind, creative (in short all the qualities I look for in men), gives me the heebie-jeebies. lol
On the other hand, it is true that not all genetic men produce the butterfly feelings internally for me, but when I've had those feelings it has only been with physical males.
You have to be hetero in order to understand this, I think.