But for some men, the act of watching their wife effectively cheating is actually something they enjoy.
Apparently, "cuckolding" - which is watching your partner have sex with someone else - is increasing in popularity. The fetish mainly applies to married couples who enjoy watching their spouse engage in sexual activity.
This, in turn, stems from the cuckoo bird, which has a tendency to lay its eggs in another bird's nest. The Metro asked a few men via an anonymous sex app called Whiplr why they like cuckolding.
One of these men included Simon, 29, an IT consultant from London - who likes to watch his girlfriend have sex with other men. Newbies who are starting out should take it slow and not dive in head-first.
He told the Metro: A few days ago, I visited a couple and was there for several hours. I like the rejection and the humiliation. The best way to keep it spicy is by letting her turn you.
For more on sex and relationships, read about how this woman's sex addiction nearly drover her to suicide. And according to research, this is the one relationship deal-breaker for Brits. Sign in.
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