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However, I performed short research about this kind of an open relationship.

Some consider cuckolding as a kind of fetish but actually, there are several types of cuckold relationship which are more or less extreme, and some of them IMHO are not extreme enough to be considered as a fetish. Most of the info on this subject I got on https://hotwifecaps.com/ by reading category descriptions so I marked off the following levels of hotwife/cuckold relationships:

• partner sharing, wife sharing, shared GF, etc - it's just about letting 3rd person participate in your sexual intercourse.

• vixen & stag - it's a relationship where partners are connected tightly, respecting, and loving each other but both of them are free to have sex with anyone they want. No secrets, no cheating, no humiliation.

• swingers - 2 or more couples take participation in group sex - IMO this is the line beyond an open relationship can be considered as a fetish

• hotwife & cuckold - in this relationship everything spins around a female. She chooses her sex partners and cuck does anything to make her satisfied. He often stays inferior to her bull (an alpha male which, unlike her husband, can satisfy her in every way), he doesn't complain about anything, he is faithful, submissive and obedient. He encourages his wife to find a "bull". In most cases, he participates in sexual intercourse just as a spectator.

• femdom, humiliation, sissification - this definitely can be considered as a fetish. A Female humiliates her partner in every single way by insulting him, locking him in a chastity cage, forcing him to dress like a woman and even forcing him to have sex with her bull (bi-cuckold).