Well in my situation he bought me a condo, made my car payments, flew my grandmother to see me several times a year and I traveled with him so......I guess you could call it a sugardaddy type of relationship since I didn't see anyone but him and wasn't in the business at the time. There was nothing illegal about what I was doing. It was a relationship and he wasn't paying me from a corporate account. There are circumstances that "confidentiality agreements" definitely need to be drawn up.
If I had been in the business then I myself wouldn't have wanted any type of paper trail.
There are also exclusivity contracts that some gentlemen want you to sign, which is along the lines of a sugardaddy relationship.