I have seen the few cocks my wife has enjoyed while we have been enjoying this lifestyle. Yes, everyone of them are bigger then me. My wife has told me about all her past lovers, not for comparison's sake, but we discuss everything. We do a great job of communication. She eventually has an open date with an ex from when she was young where they did everything but fuck because she said she always wanted to fuck him but never did. They have been friends since middle school. He lives in Florida and does come back here to visit his parents regularly. I fully support and encourage her to do it.
Her thought process on big cocks is if all you know how to do with it is use it for a battering ram against her cervix, then the size doesn't really matter. She likes a guy who knows how to use his cock to bring her pleasure, not destroy her cervix, lol...her words, not mine... 🙂