When she offers criticism of guys that hit on her, it's time for you to step up and defend the men that express an interest in her. It's your opportunity to say things like:
"Who can blame him, you're a Hot Wife."
"If I was, him, I would too."
"You can't blame him. There are lots of Hot Wives who like to flirt. Some of them even go farther."
"Honey, almost everything you wear is "dressed to impress". You have a very sexy body and you never look frumpy or fat or ugly."
"Lots of guys hit on married women. Some of them are successful."
"When they came up with the phrase, "Hotwife", they could have been talking about you."
You get the drift, this is another chance to let her know that you're ok with it and to reinforce her sexy image. Always try to insert the phrase "Hotwife" in your conversation. The next time she's talking with her sister she might mention it to her and one of them might Google the term.
Good Luck