Why you fantasize of being a cuckold?

Why do people fanasize about anything? They find it enjoyable, without need of explination.

For some of us, the idea of having a wife/girlfriend go out and having sex and comming back after she's done is sexy, just as breasts are sexy to many men.

It's not as if there aren't variations, as well. Some men will like just knowing about the sex with another man. Myself, I fantasize about my wife going out to meet men and bringingthem into the house, and using me for cleanup or additional pleasure.

To me, the perfect relationship is one in which my wife has sex with other men often, and I can explain it no more than you can explain why your ideal relationship is what it is to someone that disagrees.