For me, it is a combination of a lot of factors. First, the obvious. The sex has to be good enough to want to come back. Does she offer what you want-- MSOG, BBBJCIMNQNS, etc? Is more on the table in terms of role play or services? Is there a degree of chemistry? What about her looks? Those are important as well. Second, TCB is important. Can she be available in a reasonable amount of time? Is she consistent in what she asks for with a donation? Is she willing to offer a deal to a re-peat client As for communicating, I prefer for her NOT to contact me unless I initiate the contact. Personally, I'm not into her personal life. If we are going to exchange communication, it should be erotic in nature and be about what we are going to do to each other. Anything else is just idle chatter.
If you are looking for re-peat clients, have good in the sack skill, have an open menu, look as best you can, be readily available without jacking around on the donation, offer some form of appreciation for a client who keeps cuming back, and please don't contact us out of the blue.