I don't think that admiring another mans cock makes me gay, when I see a good big cock connected to a good looking man, a picture of that inside my wife does come to mind immediately, I have never felt the desire to take a cock inside me. On a few occasions, when I have been in the same room with my wife and her lover, I have handled another mans cock, but did not feel the desire to take it myself.
Often when my wife and I are on the beach or where there are other people around, she will often comment on seeing a pretty girl, that she is hot and if I would like to have her and likewise I have done the same, when there is a good looking guy with a bulge, I point him out to wifey.
This is my wife's favourite, I dont think anyone can deny it is good looking, but that's not a gay thing