I second this cuck or cuckolding is the act of having someone else sleep with the wife while the husband isn't allowed to participate, sometimes they don't even know about it. Though it most often implies that the husband knows/finds out/watches the act. Being cucked is having someone "take" the wife form the husband while swinging is the act of sharing lovers. Mostly it involves doing a threesome/foursome to be fair any threesome/foursome where two or more of the ppl invovled are in a relationship together is a form of swinging. There are different definitions on it though the most common use is that two couples agree to switch partners for a night or more.I would suggest you edit your personal dictionary to change the meaning of "cuck". "Cuck" = humiliation of the husband who may/may not enjoy said humiliation. Sharing/swinging is the active participation of the husband in sharing his wife with others for the enjoyment of both/all. There is no humiliation.
There are exceptions however like I watched a program called outsiders in my country which focuses on ppl who are "different" this can be anything from girls having giant boobs or guys with huge dicks and their day to day problems because of their features. Like not being able to find bra's or the guy interviewed being jealous of guys with normal sized one's since there are so few girls he can sleep with most of his gf's left him cause when they tried to have sex they would tear and many of them had to get stiches, so he envied that smaller guys could sleep with anyone.
But getting of topic anyway one of the episodes was about swingers and in it they focused a lot on Germany cause appearently they have swinger clubs/pubs where swingers can go to hook up. The place they went to even had a huge bed situated in the middle of the place where mostly wives where sent to lay down and then anyone was allowed to go up and sleep with them as long as the wife + hubby was okey with it.
This kind of went to far to be swinging in my eyes since it mostly involved the husbands and some wives sending up their partners and then they drank beer and watched how other ppl slept with them. This is going over to being a cuck instead in that you enjoy watching others sleep with your partner. Another pair had the wife work as a prostitute and they would together pick her partners and then she would come back home and tell the hubby all about her escapade again not really how I imagine swingers. A group I remember from the show was a couple of friends who had sort of always been together and they had hooked up and broken up with each other plenty of times when they were younger before they could settle down. They lived in the same apartment building and was all cool with sharing each other sexually as long as they didn't fall in love with anyone else.
But yeah in the end the episode just made it harder for me to define swingers since ppl who call themselves swingers might not be a swinger in my eye.