Is this yet another kid-dev who's understanding of "swinging" is that the male MC sometimes gets to fuck 2 women but none of the women get to fuck another man? From the pictures that seems to be the case.. again. FYI dear kids, the tag "swinging" should be used when 2 couples exchange partners (AKA "wife swap") what you call swinging is nothing more than a threesome MFF which might be considered "group sex" and may be the staring point of a swinging life style, but as long as only the male fucks other women and the female doesn't fuck other men, that's NO SWINGING!
And no, real swinging wouldn't be NTR either coz nobody steals anybody and there is no jealousy involved, it is consensual and agreed upon. Of course you won't find this type of life style in those mangas and japanese games where you come from but in the western real life of which you seem to have no idea..
If sex of a male with 2 women is what you call "swinging" than that tag should be removed. It is confusing for people like me who look for games with real swinging and find only this understanding of the term..