As a guy getting ready to do a wife swap do you stare at the other husband's cock to see if it's bigger than yours?

More power to you! That's one of the reasons I could never do this... luckily, she doesn't mind and has been more curious about bringing in another f in for us both to have fun and try new things. We'll see how that goes, though. It hasn't happened yet, and I won't hold my breath either, lol.