We already have a tag for cucking. It's Netorare, formerly NTR. And is by no means a better tag, as it is not at all appropriate even by my "NTR hating" standard, and will only piss off the NTR players. Sharing is the correct tag, but as we do not have it, the closest and most appropriate tag in its place is the now added Swinging tag, as it gets the point across for those who want to avoid any form of sharing or other dicks on or in the MCs girls. And who's to say MCs buddy is the only one getting to rub cock on all the LIs in the future with the way this pulled a wildcard.
I'll most likely not know, as I've dropped this game, and I'll most likely never check on it again.