It's easy to see why an ML or WL wouldn't want to see her BF in the shop.
Just think of the scenario: She has a session with her BF in the shop. After that session, she has another session with a regular punter. Now the fact that she just fucked her BF and immediately after that fucked another man is staring both her and her BF in the face. What happens next? If her BF is not OK with it, she might have to stop working... not good. If her BF is OK with it, that means he is OK with her fucking other men.... not good either.
It's a lose-lose situation for her.