I hate this, there is no right answer. If you say no or "I've only had one client" it's a guy who wants to see you as the naughty, sex-crazed girl and gets off on thinking of you doing a bunch of different men one after the other all day. If you say "yes, very busy" it's a guy who wants an image of you as a good girl who only wants to sleep with him. I've stopped caring and will answer honestly with a yes or no but not go into specifics. They know what I do, and if they can't face the fact that they're paying a woman who has had sex with multiple other men that week or even day then they should probably find another hobby...