Could be both. I don't have definitive ideas, but if you pick the "share" option, you might (will) see the main cast have sex with male protagonists. I consider that, if you pick this option, you're fine with the main cast having situations with other males.
That being mentioned, would there be an option in the future for all the girls to corrupt them into public whores or is that path reserved only for antagonistic characters as a form of punishment?
Specifically interested in main cast of girls having at least "slutifying" sharing options? You mentioning there would be plans for sharing is enough for me to continue to play for now because i find harem only trope boring even though i understand it should be main focus of the game. Lauren phillips for example is a good choice because she has extended catalogue of gang bangs, orgies, etc.
Otherwise interesting story especially with passenger parasite inside protagonist mind, kinda remind me of venom franchise in mainstream media even though she doesn't materialize, maybe there could a path in the future where she could be separated from main character and maybe being able to interact with her in material world and not in dreams only.