One of my all time favorite movies ... Love and Sex (Jon Favreau, Famke Janssen).
"When her rather explicit copy is rejected, magazine journalist Kate is asked by her editor to come up with an article on loving relationships instead, and to do so by the end of the day. This gets Kate thinking back over her own various experiences, and to wondering if she is in much of a position to write on the subject."
Source:
www.imdb.com