I was under the assumption that most female escorts would prefer their clients to be good looking, well groomed with good bodies, rather than an old guy who is out of shape and not well groomed. I didn't particularly mean some guy who just wanted to bang you until you were sore.
I've never met a prossie who gave a toss what their clients looked like provided they were clean, hygienic, polite & respectful - it's work, and a punter's physical appearance doesn't even cross my mind when I'm doing my job than it would if I was a nurse, a tattooist or a care assistant.
Provided somebody meets the above criteria (and I could personally throw in a few more like being punctual, intelligent and in possession of a sense of humour) they'll get the best standard of service I can give, and I'll both enjoy providing it and look forward to seeing them again.
One of the 'self-tests' we often recommend here for newbies is to go into a cafe or shop, or just walk down the street and ask yourself if you could have sex with every one of the men you see, provided he was clean and polite. Related to this is realising that you can have very successful sex with people you don't fancy, find remotely physically appealing or even like.
Edit: crossed posts with Cat