I strictly do outcall and pretty much have standard greeting phrases after I open the door for three scenarios..
If we've never met before, I'll ask her if I'm acceptable to her and if we can proceed, which is my way of setting a tone and subtly reminding her that she has voluntarily chose to be there. However, after watching Catherine Deneuve in Belle de Jour last night, now I'm thinking for some ladies that may ruin the fun.
If I've met her once before I'll playfully ask her if she remembers me. It seems like I always get the answer yes, which makes me wonder why i would ask a question that likely gets dishonest responses. I recently got a NO though, from the witty Tiffany from Vogue. She tells me she doesn't remember me but smiles and says that she only remembers bad things. Fast forward 10 minutes later when I'm lying on top of her slobbering uncontrollably and she proudly exclaims "now i remember you", perhaps forgetting what she told me before, or not.
If it's a multiple repeat I typically just apologize for not having any clothes on.