I see all types of couples at my parties and for the most part they fit one of several categories.
Cuck couples - couples where the husband is a cuck.
Hotwife Couples - hubby is not a cuck, he simply enjoys seeing his wife with other men
Dom/sub couples - couples where the husband is the Dominant of the female and he enjoys sharing her with other men.
Now obviously there is a lot more to it than just this but I find that most fit into one of these 3 categories. From my perspective, the biggest difference I see between cuckold couples and hotwife couples is that there is typically some level of submissiveness in the dynamic in a cuckold couple. This may take many forms including humiliation, denial of sex, degrading language, etc. Whereas in a hotwife dynamic there may not be any trace of submissiveness whatsoever. My last party I had 10 couples. of those 2 were cuck couples, 7 were hotwife couples, and 1 was a Dom/sub couple.
Again, this is all simply my take on things so feel free to comment.