A few of my friends are still surprised I have some lovers that aren't "on the clock" so to speak. That just because I'm charging for it now, they thought I wouldn't be seeing anyone.
I admit that it's hard to be a single girl and still participate in casual sex and dating while you're shagging on a semi-pro basis - but it is possible.
The easiest way of explaining it is the way I told one friend..
The difference between a client and a real lover is when they email and ask what you're doing. To the client you reply something like, "Sitting in lace underwear at home since it's so hot/Thinking about taking a cool shower/or watching some porn". To the real lover it's "wearing trackie pants, scrubbing the bath."
Fantasy vs Reality.