Swinging is couples swapping the women.
If everyone isn't fucking, that's cuckoldry(netorase).
NTR(netorare) is your woman being stolen, may or may not involve fucking ( narrator : it always involves fucking ).
The relationship ends in favour of the one doing the stealing.
Cheating is your woman getting fucked by not-you, without your knowledge, but the relationship remains.
Results in a relationship as unstable as an anarchic state for a polity, ending in either swinging, cuckoldry, NTR or outright end ( may involve murder).
A futa by both definition and the very etymology of the word is a woman with at minimum a penis, on top of the vagina.
Whether the penis replaces the clitoris or is in addition, whether the balls are external, internal or not present at all, as long as it's an obvious female ( breasts, female bone structure, vagina, uterus, a soul as black as a moonless night ) with a penis, it's a futa.
Source : it was revealed to me in a dream.