here's the thing, if a girl, or boy, helps pay for the mortgage, or any utilities in a home owned by the spouse, they have a legal claim to half the property if they broke up. Knew this happened to a guy, his lawyer advised him to offer her $5,000 and to fk off, she accepted, signed the waiver and never heard from her since.
Unless what you are charging is explicitly rent, and you have a rental agreement. Which you can do, and probably should do in such a circumstance. Charge her rent, just don't lie about the circumstances surrounding her rent
And if the girl won't have agreed knowing the truth, then she probably isn't someone you want to live with.
And if the girl won't have agreed knowing the truth, then she probably isn't someone you want to live with.