I know exactly what you are saying. I've looked at guys and said out loud "I wouldn't want to see you doing him." But, so far my wife has been in agreement with me on who these guys are. She has surprised me on occasion with guys she thinks is attractive, since they are so opposite me. They weren't turn-offs to me, just a surprise. But tastes vary. I'm not attracted to just one type of woman either.
Both of us hold veto power though, and if she said the same about a girl (and she has) I would not do it. I think if either of us ever did, then there would be problems because one of us would be putting the other second to the outsider.
Mr. WS