It's surprising (here in Australia at least) that much male bravado and eagerness to "fuck" a hotwife diminished rapidly when the wife mentions "My husband knows/approves/encourages me" Almost like the guys would rather a cheating wife rather than a honest Hotwife.
Perhaps get her to take some photos of her body and post them on this site... im certain the response from the other members will be hugely positive and give her some self-esteem boost.
Get her to call you and put the phone next to the bed, your imagination will fill in the blanks and you'll get to hear it all. Pictures if possible of creampie are hot too. As long as you are not jealous and going to flip out about it later.
I think you're being a bit full on for a guy that has just told you he and his wife have only ever talked once about the lifestyle. You may be an experienced cuck, doesn't mean this gentleman will go down that path so far.
There's some really good podcasts made by hotwives, there's "The AuthenticHotwife" , "The Latina Hotwife Adventures" and "The Ethical Slut" and there are many others I'm sure. All fairly tame and respectful.