Agree with this. Repeat visits show loyalty and just keep at it. I always bring condoms and an extra $50-$100 just in case.
Also always try to slip those fingers in to the pussy and then strategically ask for sex at the right time. Can't say I have a great success rate. I have only 1 regular ML who gives me FS all the time but suspect she does with a few punters. About 5 others that I had success with ages ago. They all long gone... Wouldn't mind some backups!!