Cuckolding is a fantasy that both my wife and I have entertained for a bit over 10 years. She was actually the first to raise it after she came across some cuckolding porn. I’d had similar fantasies for a while but hadn’t yet raised them with her. 

The confession of these desires turbo charged our sex life for a while as we explored the fantasy further. But the pressures of kids, life etc has meant that we’ve never gone through with it IRL. Recently I’ve confessed to my wife that I’d like it to happen in person. She is considering but views it primarily as a fantasy that we both enjoy.