What is the average female SP? I don't think there is one, as there is no average client. I think it has more to do with what type of client is attracted to what type of SP. Married, separated or older men (in general, mind you) tend to lean toward the GFE type of SP. Younger guys, attached or single, are usually looking less for the 'experience', and more for the actual act, and tend to lean more toward the younger playboy type of SP's. This is all pure generalization, and the variety of clientel amazed me when I first started. I've seen every type of man from the rich and powerful to the guy who should really be paying his rent or buying food instead of spending his last dollars on me. But for the most part it's the guy in between all of that.
I never time the service (can't see the clock while giving a bj), how incredibly boring that would be. What happens is dependant on the client and all the factors that have to be taken into consideration when you are intimate with anyone - chemistry, who's the aggressive or 'leader', mood (of both the SP and the client), etc. I can't speak for other SP's, but I never plan a session, I just go with the flow.
I've never bumped into a client, but if I did, I would just smile and look away. Not only for his privacy and discretion(sp?), but for mine as well ('Hey, look! It's the local whore! Let's go say 'Hi'.')
I don't know many other SP's, so I don't know if they have boyfriends, though I have met a couple of girls who do. I don't have one and don't think I would want one while working as an SP. Too wierd. What do you say when they ask how your day was? 'Great until I got cum in my eye.'? No, I don't think that could be a very healthy relationship.
Hope that helped you out