You are partially fine:
Netorare (abbreviated as ntr): The MC is deceived and suffers, perhaps he is excited but he is not in agreement with what is happening.
Netorase (literally means cuckold): the MC gets excited watching his girl fuck another man, and seeks to make this happen.
Netori (the only decent one): The MC steals someone else's girl, no one cheats on him.
For the purposes of this page the corresponding tags are:
Netorare (ntr) = netorare.
Netorase (accepted cuckold) = netarare or swinging (depends on how cuckold the MC is, if he participates in the action it's swinging, if he just observes or loses the girl it's netorare).
Netori = cheating.
It's that simple, in case anyone still had doubts.