Partner watches tranny porn all the time...?

He's addicted to porn for sure. He's probably masturbating a lot and becoming much less sensitive. Porn in general will do this over time. All these things in and of themselves are not so much a problem. The problem occurs when he's taking affection away from you. That's akin to cheating you of what you deserve. Time to lay it on the line. Give up the porn and get straightened out or you may be finding someone who does have the time and energy for you.