Originally Posted by RiverRat13
I think it was more that he respected Joan. He wanted to pimp Sal out to the Lucky Strike guy out a couple of seasons ago. I know his marriage has changed him to a degree but I don't think any carnation of Don asks Joan to do what she did.
Don and Joan have always had a mutual (non-sexual) admiration for each other the whole series if you've paid close attention. Best example is "A Guy Walks Into An Advertising Agency" from season 3. There's been other moments as well. As soon as Pete brought it up I knew Don wouldn't be happy. I was surprised Bert went for it. He's usually the voice of reason.