I see we're talking about aroallo Hawkeye so allow me to add the headcanon I've been cooking for the past month or so: bi demi-ace BJ
He's never been tempted to cheat on his wife because he's straight up never been sexually attracted to anyone else. He used to have kind of a superiority complex about it but eventually he figured out that no, he's the weird one. (It's fine, everybody always knew there was something wrong with him, at least this is pretty easy to hide.)
Then he meets and falls for Peg and okay, this is fine! This is great actually! Maybe he's not fundamentally broken, he's just very picky and everything worked out all right in the end, he's got a beautiful wife and is halfway to the expected 2.5 kids and he can be Normal After All