There wouldn't be anything like Personas in terms of acquiring and using different Persona; the Main Area is simply based off it in that it exists and doesn't exist at the same time; question is whether it is real, some supernatural phenomina or a hallucination (think Danny in The Shining; did he really hallucinate or where those real or is it a mix?)
Instead of Igor you have Bartender. I suppose Nameless and Belladonna would be there but as ambience but as different people.
This is all entirely made up on the spot, mind you. So, uh.. appealing to potential love interests would revolve around "small" things like taste in clothing, interests, topics of conversation and potential future plans (start a family or something to appeal to those looking to start a family for example). Since all sex games are essential self-inserts this would be no different and play upon how you could potentially change either drastically or not at all in pursuit of said romance.
And this is where the aspect of how you see yourself vs how others see you comes into play. Bartender see's you as your ideal self seeks to gently push and prod you along the path of realizing that. The variety of romance partners means there are some who would only be pleased if you change to suit their needs, while others are happy with whom you are and so on. I suppose the aesop would be that it is fine to change small things about yourself to appeal to more potential love interests, but neither should you complete change who you are just for the possible chance at some bumpin' uglies.
