I don't know the the rules of what mmf and sharing are in the context of these games, but there's not been any threesomes where two of them are guys except for Arieth, but the player does not have any sexual relationship with Arieth, she's basically having sex with almost all the DIKs except the mc, and she occasionally does more than one at a time.
Also the MC can bang a married woman, but it's basically just cheating on the woman's part, and the mc is also doing the dirty with a girl who's already in a relationship, but her boyfriend's possibly gay, so I don' think there's much sharing going on there.