Concern

I am a str8 male. My wife and I are both early 30's and have great, usually daily, vaginal and or anal sex.
I have always enjoyed eating my jizz after ejaculating, going down on my wifes vagina. or anus, and doubt there is anything "gay" about that. Is there?
My concern is that when we watch porn together, mostly between romps to get us back in the groove for a secound round, I have become more and more interested, and sort of turned on, by abs, pecs, glutes and penises, rather than breasts, vaginas and tails.
It could just be a comparison thing...I am in pretty good shape with well defined, but not ripped, abs and pecs and have a sizeable penis. My wife grooms and trims my pubic hair and sometimes my chest.
So what to make of this?
After watching the porn our second round is always the better of the two...longer with more intense orgasms for us both...my mind wanders occassionally...is that a dudes anus I am fucking?
Will it ever be?