I like women. I like the shape and curves of the female body. I like boobs, I like asses, I like pretty vaginas. I also appreciate and am aroused by a nice cock. I’m however not otherwise attracted to the male body. I like femboys as long as they have a feminine-like shape and curves, as many of them do.
WTF is my sexual orientation?
My interpretation is you enjoy looking at it the same way you enjoy watching other people have fun. You know what it’s pleasure feels like so it’s familiar. I suspect this is also a driving factor for a preference for anal porn. Men don’t know what it’s like to have vagina, but they’ve got some key similarities to a female ass in sensation (that’s not a joke about a butt being a butt, the vagina and clitoris has nerve endings that are stimulated during anal).