I think it must be very hard for cucks and wannabe's, to have to keep their desires secret. I think even if their wives have no interest in fucking other men, and a lot don't, it would be better to at least explain to them who you are and what turns you on. Some wives are happy to play along, maybe wear an anklet for you or at least describe what their previous sexual partners were like. Even the wives who have zero interest, might still enjoy buying you a cock cage to stop you from jerking of and relish in having you as a subservient hubby, willing to do menial chores for some extra pussy.
I think it would help the cuck as well, and bring the couple closer together being honest. I don't think the wives can help if they don't know. And yes, most won't open their legs for other men, but a lot might enjoy the mind games that can go with cuckolding
Just my 2c.