Though you're skipping over Stan and Jeremy sucking each other off if you want to actually mirror the dynamics
I think the same argument could be made though, that Jeremy's influence on Stan was toxic rather than healthy, as it boiled everything down to a pursuit of sex, and viewing sex in a transactional manner.
And I agree, Ivy is a manipulative bitch, but she also believes her actions are correct or even righteous. Seymour would likely relate to her as a fellow Master/Child.
Personally, I do believe having a slutty period in one's life is a good thing overall. The game ignores STI/STDs, pregnancy risk, and minimises potential reputational damage. Domestic violence is also ignored as a threat, and a trip to service a gloryhole is at the extreme edge of a slutty phase. But I view a benevolent slutty phase as being one of exploration and personal growth and understanding. Ivy's version goes a bit beyond that, imo.
But it's a porn game, so reality doesn't need to rear it's ugly head at every corner. This game at least includes condoms, if briefly. So it's ahead of most games here.