Have you talked to him about it? For a lot of us guys, when we are approached by our women about things like that, we get defensive and block them out. If porn in general doesn't bother you, just the curiosity in his new tranny interest, try this: Ask to watch porn with him. If he agrees and you're watching together, casually ask him what kinds of porn he's into. Maybe even make a subtle comment about trannies. Just mention the word and watch his response. If he's honest and tells you he watches tranny porn, ask him if he is 100% straight or if he has curiosities. His answer may surprize you. Personally, I'm very straight. I've seen and been aroused, and masturbated to tranny porn. Mostly when a tranny bangs a hot porn chick. There's just something strangely arousing about a hot woman with a cock and balls railing another hot woman. I've seen the tranny and guy stuff, but it really does nothing for me. I'd never personally consider have relations with a tranny, nor a regular man. However, If I was filthy rich, single, and had the opportunity, I've thought about buying myself a nice pair of fake tits, just to try them out for a year or two. Am I wierd, yes, but not bi or gay. I don't long to be a tranny, nor do I watch a lot of tranny porn, but sometimes, it is a little hot... Ask him and find out. I wouldn't be worried unless he gives you a reason to worry.