It's called Cuckolding, and many committed, loving, and trusting married couples engage in it.
The word "cuckold" derives from the name of the cuckoo bird, which has a habit of laying its eggs in other birds' nests.
Indulging this fantasy has the potential to improve your relationship and make you stronger as a couple, but it takes careful planning, communication, and honesty throughout the whole process.
And, if you're curious but don't want to go all the way with a stranger, try role playing a cuckold scenario first!
In modern fetish usage, a cuckold is compliant in his partner's sexual infidelity.
Then, out of nowhere, he told me one day that he wanted to catch me in the act of having sex with another man. Although I have zero sexual attraction to other men, I agreed to try it out.
The question then became where to find a willing male participant.
One hot wife explains, My new husband and I have always enjoyed our sex life.
We have been together for five years now, and our sexual energy together still feels electric.