Escorts, by virtue of their profession, must love their bodies. The common woman often does not. They take the time to pamper and primp their body because it's an expression of love and care for themselves.
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Throughout history, courtesans weren't paid only to be beautiful, but to be witty, smart, engaging and often had access to a world of learning that other women did not. They were allowed to challenge men in ways that other women often could not. Some would even go to say that the women who were courtesans by choice (not by lineage or force) were the early feminists -- embracing knowledge and regaining control of their sexual pleasure.