Netori and netorare. Cuckoldry by the protagonist and cuckoldry by a third-party, respectively. Someone forcefully takes someone else’s lover in either case.
I would say that, overall, fans have mixed reactions to these controversial sub-genres. The dislike is natural to comprehend. These are cute anime girls who are coerced into cheating or being outright r**ed. We’re talking about potential waifus here. Some wonder why a viewer, escaping from their possibly own hellish, 3D world, would want to observe equivalents in 2D. The escapist in myself understands the plausibility of such sentiment.
And yet, while netori and netorare are two sub-genre examples of hentai that are a reflection of many real-life relationships–must I provide divorce statistics?–they exclude the emotional and financial consequences, namely alimony and child support–relationships in general for a few. One gets to view the absurdity of a failing relationship which potentially acts as a reminder of the many (expensive) ones in his or her own world. No actual harm done in the name of escapist fun.