The Babysitters (2007)

High school senior Shirley works as a babysitter to save money for college. She has a serious crush on Michael, father of two of her regular charges. One night, Michael and Shirley share a forbidden kiss, and he gives her a nice bonus on top of her regular babysitting fee. After Michael's married buddies find out and want in on the babysitter action, Shirley becomes a high-school madam, arranging dates...

Genre: Drama
Tagline: These girls mean business.
Starring: John Leguizamo, Cynthia Nixon, Katherine Waterston, Denis O'Hare, Andy Comeau

Plot: A teenager turns her babysitting service into a call-girl service for married guys after fooling around with one of her customers.

http://www.imdb.com/title/tt0796302/
http://en.wikipedia.org/wiki/The_Babysitters