I Want Other Men To Fuck My Wife

I'm a 45 year old male. My wife is 18 years younger than me. She's really sexy with big boobs and a great figure. My biggest fantasy is to undress her and present her to another man and watch him fucking her while she makes eye contact with me. We've fucked on camera for a few guys we met online, and she loves dirty role play stories (the most recent one had her fucking 6 men at once), but in reality I don't think she'd do it, and I don't know how to talk her into it.