So from my experience, the corruption only goes up when you interact with one of the women and choose to ignore her. I don't know about you but when i intentionally don't hang out with someone, i also don't care if they hook up with someone else. The corruption meter never goes up unless you approach the character, they will stay on zero forever if you don't talk to them. It feels like everyone is frozen in time and only exist when talking to you, which is the number one thing you shouldn't do if you want your game and it's characters to feel alive. NPCs shouldn't feel like they were put there only to interact with you, the player shouldn't feel like they are the only real person in the world.