I got a lot of favorites...

1. The Chicken Ranch-1983-A documentary about life at the famous Nevada Ho' House. The ladies are all reputedly authentic. Don't know about their customers. Would guys really let themselves be filmed patronizing prostitutes? Sometimes funny, sometimes sad but always entertaining.

2. Working Girls-1986-No, not the Melanie Griffith film. This one is a pseudo-documentary about a day in the life of a Manhattan brothel, complete with an obnoxious madame. The ladies run the stereotypical gamut here. You got your sharp businesswoman, college student, moonlighter, drug pusher, naive newbie, etc. The johns are hilarious and likely true-to-life.

3. The Client List-Jennifer Love Hewitt takes a job at a Texas massage parlor and finds that sacrums aren't the only things she'll be rubbing. This later evolved into a short lived TV series.

I'm sure there are a lot more but these are a few that come to mind.