Wow I baffled with the replies . Very simple, TS porn is one of the top 5 categories of porn, and clearly the targeted audience is not gay males. Straight men like dicks, they are infatuated with their dicks.
Truly straight men like their own dicks, and using them with women. Sorry, but straight men are
not infatuated with other men's dicks. Yes, we like to see porn where other men's dicks are interacting with women, but not other dicks.
TS sex presents them with a perception of feminine energy that allows them to explore sexually in which in a M2M encounter won’t. And it doesn’t mean they want to have sex with men, or male presenting people. They want the Dick and TS is a safe option.
That may be true for some, but I bet it isn't even close to being a majority. Personally, I would have trouble being sexually intimate with a fully transitioned (post-op) female, but that's me, my own opinion.
Personally I have a few married straight friends that enjoy TS porn and have experience TS sex, yet they have no interest in men.
The only TS porn I ever watched was Angela White have sex with a TS woman who still had her penis. It was enjoyable, as the penis was interacting with a gorgeous woman. As a straight man, I have zero interest in 2 penises interacting with each other in any way. To me, double penetration is bisexual behavior, even when it's in a woman's vagina.