I can relate to all of this well. Yes the male body can be beautiful, but that does not necessarily mean you are bisexual. I find animal bodies to be beautiful, look at a tiger or an elk, they have amazingly developed bodies, but appreciating that doesn’t mean I am into bestiality.
I get pleasure out of wearing nice things, and I have come to realize that there is nothing wrong in that. My wife gets pleasure in gardening, and no one questions whether it is right or wrong. I would just take your time in explore these new ideas, concepts and sensations. It sounds like you have a wonderful wife, so keep the dialog open and just relax and enjoy the journey you are starting along. You are not doing anything wrong, you are just doing something society just doesn’t really understand. It is societies problem, not yours.