Japanese definition from wikipedia:
寝取らせ男性自らが自分の恋人や妻を他の男性に抱かせて、精神的な性的快感や嗜虐感を得るというジャンルの作品を指す。
"NTS (Netorase)" refers to a genre of works where a man willingly allows his lover or wife to be intimate with another man, deriving psychological sexual pleasure or a sense of masochistic enjoyment from the experience.
The word "嗜虐感" (shigyukukan) in English can be translated as "masochistic feeling" or "sense of masochism." It refers to the psychological pleasure or satisfaction someone experiences from being dominated, humiliated, or witnessing or allowing someone they care about to be involved with someone else in a way that involves power dynamics or emotional discomfort.
In this context, it refers to a type of pleasure derived from a situation that might involve submission, humiliation, or the discomfort of being emotionally or physically "hurt" in a way that leads to personal satisfaction.
I will stick with the japanese (i.e. original) definition of NTS rather than the definition invented by a bunch of random westerners on VNDB.
Source:
You must be registered to see the links