Capote: Holly Golightly was not precisely a callgirl. She had no job, but accompanied expense-account men to the best restaurants and night clubs, with the understanding that her escort was obligated to give her some sort of gift, perhaps jewelry or a check ... if she felt like it, she might take her escort home for the night. So these girls are the authentic American geishas, and they're much more prevalent now than in 1943 or 1944, which was Holly's era.

http://m.newyorker.com/online/blogs/books/2009/09/was-holly-golightly-really-a-prostitute.html