To simply quell the argument, I do have something to say on the matter.
So, I'm guessing that this is to try and let the largest player base enjoy the game as possible. Which makes sense. There have been several people who have been displeased about the Lillian content, and several people who think it fits her and like it or don't mind it. When you make a game, it makes sense to want to be able to appeal to as large a group as possible.
Maybe I'm wrong, but I feel like the people who are urging the discussion to not just be a simple "Okay, I'll stop!" are mostly the ones who were okay with the content to begin with? In which case, that part isn't being written for us (I say us, because I fully intend to let her keep doing the behaviour if she wants). So for my part, whether she agrees easily, or not, won't matter since I won't be telling her to stop.
There are people who are in relationships they enjoy that don't seem "fair" from the outside. A lot of harem games wind up that way, because there are a lot of people who like the idea of being with a bunch of women, while the women are only with them. That's the fantasy they want. For a lot of people, this would seem like an unrealistic, or unfair relationship. There may be people out there that would be fine with it, though. Some people are into a lot of things I don't understand, and in the end, this is a fantasy.
Now, if I'm wrong, and it's the people who don't want the behaviour to continue who also don't want it to be an easy thing to get her to stop, then that's certainly something that to my mind would carry more weight.
In the end we all want to enjoy the game as much as possible, and I guess what I'm trying to say is, if you're arguing about how things will go on a path you don't intend to play (and I really don't know if this is even the case, I'm just guessing about that in the first place), it feels kind of pointless, and has the potential to ruin someone else's fun.
For the record, I get where everyone's coming from that doesn't like the idea that she'd just give something like that up. If it were a required branch of the story, I'd be with you, but it's a part of the story that's not being written for me, and if other people like it to be different that will be going down that story line, then so be it.