My ex and I were good friends with another couple, and I knew that the other man and my wife were somewhat attracted to each other. He and I would discuss such things as our wives' tit sizes, and tell how much hair they had on their pussies.
Then I found that our wives were doing the same thing, and my wife admitted that the other wife had claimed that her husband had "a really big one". I asked my wife what she had told her friend about me, and she said she said that I was "Okay" which may have been true, but which did not help my ego.
Once, my friend and I were at the health club together and I saw him naked in the showers. His wife was right about him having a "really big one". His dick seemed to be as big, just hanging soft, as mine was standing up hard.
I slipped this bit of information into a conversation with my wife, and her interest was obvious. We even discussed the possibility of her getting a look at his "big cock" and I tried to think of a way to make it happen, but it never did.