Japanese definition of Netorase, taken from the jp wiki article on 寝取られ:
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。
Translation: "Netorase" refers to a genre of works where a man deliberately allows his partner or wife to be intimate with another man, deriving mental sexual pleasure or a sense of masochistic satisfaction from the experience.
The word 嗜虐感 (Shigyakukan) refers to the feeling of deriving pleasure, often psychological or sexual, from acts involving cruelty, humiliation, or the infliction of pain (whether emotional or physical) on oneself or others. It is closely related to the concept of masochism or sadism, depending on the context.
Source:
You must be registered to see the links
Vulgar Reverie is doing nothing wrong. It is a true NTS. Tourists need to stop trying to impose swinging/vanilla sharing/stag&vixen, etc onto NTS.