For gay and bisexual men: what would attract you to a straight man? How could you tell if they would be willing to be with a man sexually? [I Am Straight But Bi-curious]

I have met quite a few men that you would think were straight and most were married. I think all guys must wonder what its like, especilally if they have watched thier wife suck thier dick, and videos too. They are first attracted to what it must feel like, and what it feels like in thier mouth. After that, all men love anal, either giving or recieving.