I've been a cuck throughout my marriage. My wife initially just carried on seeing people when we met, she was initially a bit coy about it and then when we realised what a turn on it was for me we went full "scene" for a little while.
We've evolved beyond that now as she felt pressured and didn't really enjoy it. She's much more Domme these days and practices celibacy for me with orgasm control and denial when she edges me. She likes the sneak, so it's a "don't ask, don't tell" policy with her boyfriends, but she gives me lots of hints and is fairly brazen, enjoying the control that this gives her.
It's a whole life thing for us and we both love it.