Mikey's wife wants a divorce, and to support him, his friends Jason and Daniel decide to help him become like them, who never have a serious relationship. They form a pact with a focus on living life and not getting tied down. However, it all becomes a greater challenge than they had anticipated, especially after Jason meets Ellie (and David has become more than just friends with their mutual friend Chelsea).
The movie is decent and not entirely without merit, but Jason's and Daniel's pretty awful attitude towards treating girls from the beginning of the film diminishes the impression for me. That they would change so much seems quite unrealistic.