Netorare took me a long time to wrap my head around. Mostly because traditional male-focused humiliation-NTR does nothing but enrage me, and it always bothered me that I didn't understand the allure. It started to make sense when I considered the possibility of female-focused NTR, and it fully clicked after I dug through the internet and discovered some further information being shared by a bunch of weirdo fetishists on the subject.
Essentially, we can divide NTR into two main categories, irrespective of gender. The first category, and the type that you're most likely to encounter on the internet is going to be Humiliation-based NTR, this is your male-protagonist being humiliated by his girl fucking other men, being unsatisfied by him, essentially your run of the mill inadequacies being dwelt upon. Same basic category as any other sexual degradation/humiliation.
The second category is what we would call Compersive-Cuckolding. This is close to the exact opposite, as rather than reveling in one's sexual inadequacies, it's about deriving pleasure from the appeal and virility of one's significant other by-proxy. Instead of being the subject of degradation, you could potentially interpret this as self-aggrandizing in nature, because all of the other lovers are secondary compared to them, THEY are still at the top.
Basically, contrast a boy crying and sniveling as his girlfriend is being fucked around the corner and crying out how much 'better' this lover is compared to her boyfriend... against some absurd Aphrodite type using up men like Kleenex and then fawning over her one 'special' fellow who actually really matters.
Although that being said, despite the difference between the two styles, I would honestly sooner draw a dividing line between GENDERS of the NTR. There's far more cross-contamination between humiliation and compersive than there is between men and women... I mean I have a hard time even imagining the brain pattern that would require.
Anyway... If we're going to have an NTR Tag, I would strongly recommend adding a second one and splitting it evenly between male and female. Possibly in the form of "NTR - Netorare/Cuckolding", and "FemNTR - Female NTR/Cuckquean".