Shower. Shave all body hair as thoroughly as possible. Dry and straighten hair.
Clean toys. Coil rope. (Or do that cool chainy thing where it looks like a big messy knot but it all comes apart neatly with one pull--I don't know what to call it but I like to do it.) Pack toybag.
Select underwear: skeezy, matching, easy to remove, and preferably not ones that he's seen 50 times before.
Select outer clothing: feminine, only subtly skeezy, easy to remove.
Avoid eating for a few hours before.
Plan out at least the rudiments of a scene if he wants to bottom.
I don't go through this for Alan. I try to be clean and all, but I pretty much show up as I am for him and any other "regular" guys. It's only when I have a date with Benny that I always do a full ritual preparation beforehand. I'm not even sure if he really appreciates it. I could sigh and go "Oh, the things I do for that man," but really... I don't think I'm doing them for him.