Lost interested in women after crossdressing?

I am a 35-year-old married man, I have only had hetero relationships, but lately I have been fantasizing almost exclusively about slightly older men. I was not interested in men before. I discovered my crossdresser orientation about 1 year ago, and since then I have bought myself a lot of clothes, dildos, etc. My wife does not know about it. I have noticed that in porn I only watch men, and I am especially turned on by slightly older, dominant men, but almost exclusively. Not by women. Of course I look at women on the street, but they do not sexually excite me. It is as if women in clothes excite me, but as soon as I see a man and a woman without clothes, I feel a sexual desire for a man's body and penis. Am I so "hungry" to try sex with a man, or is there an explanation for this? I do not want to cheat on my wife, but on the other hand, the submissive role and a dominant man would excite me sexually... has anyone been in similar shoes? My wife and I have good sex, but lately we've been fantasizing about MMF threesome a lot.