Him: Hi Becky. I saw your ad on Eros. I wanted to ask if you could do outcall for me, but it's be sort of a trial.

Sexy Becky:  Can you please explain to me what you mean by a sort of trial?

Him: I would not pay you besides maybe a small deposit, however if you do a good enough job satisfying me, I will book you every week and pay you in full. Would you be open to that?

Sexy Becky: Are you losing your mind? I don't think so.  

Him:  No, I'm not. I want to find a permanent girl, and this is the most effective way to determine who is good enough for that.