Having watched my wife and another man fuck on many occasions, I can't blame this guy. It crazy hot! Also, it looks like his wife might be taking it in the ass, so he definitely gets a pass.
I've done that, and it feels so fucking good with my cock jammed in my underwear as I feel like I'm going to cum whether I want to or not, as I watch my wife being fucked. The feeling just keeps building up until I feel my hot cum squirting around my nuts and stiff throbbing cock.