in my experience,
I first discovered "transgender" porn a few years ago. I never even knew about it until something inside mean yearned for "rear" stimulation. This was in my mid 20s. Hard to describe unless you feel it yourself.

I became completely obsessed with it. I even acted out scenes and saw myself in scenes as both top and bottom. I soon realized this type of porn aroused me more than any other. I stopped watching "regular" sex scenes as they did nothing for me anymore, yet trans porn made me really huge!

It later caused me to question whether I was gay or trans myself! I struggled and even tried being intimate with real trans girls. Yet in real life situations the penetration felt very uncomfortable and awkward at first.

I soon read that the male biology causes the prostate to be extremely stimulated during colorectal penetration of some sort. It causes much more intense orgasms in a guy.

It has clouded my ability to really date and have sexual relations with normal girls.. as a straight guy which I am. because "enjoyable" sex for me involves such raunchy activities yet most girls will not partake in that.