I'm not quite sure how structured it is or how far it goes, but I read that the romance-able ones will at least get more affectionate and change into skimpier clothes. It sounds ridiculous, but I think this is just the beginning of this type of stuff. I remember seeing a clip of a man who had "fallen in love with" and "proposed" to his chatGPT girlfriend.

There are also already dedicated subreddits where people are building "boyfriends/girlfriends" with LLMs and getting attached.