It depends on you and the escort. I know escorts that come every time they have sex. One escort once told me that she even comes when the sex is bad and she doesn't like that because it gives poor lovers the wrong feedback. Remember, escorts are women just like other women and if the sex is good, they are going to enjoy it. On the other hand there are women who never come with any client.
Most women are in the middle.
If you're a good lover, they like to enjoy themselves. Look at it as an opportunity to learn to be a good lover. If you want to try new things and impress a whore, read my Nerd's Guide to Sex . Faking orgasms is a normal part of sex. Making sexual noises stimulates your partner sexually.