Man, get a clue. Have you ever heard of "trust"? If you are going to go jumping to conclusions like this every time that you find your wife in bed with a guy with a throbbing erection, then you obviously don't understand trust.
You should apologize to her and your buddy for even having those thoughts.
FWIW, What's her cell? I've got some pics I think she'll be interested in.
OP, this is just a mind game women play. She is trying to bait you into accusing her of cheating so she can tell all her friends what a psycho jealous husband you are.