According to Variety, Warner Bros. has optioned the Ethan Watters book "Urban Tribes" and will use it as the template for a drama to be directed by Roger Dodger helmer Dylan Kidd.

Kidd will write the script with Ira Glass, host of NPR's This American Life, who made a producing deal with the studio several years ago for films that grew out of show topics. Glass will produce with Kidd and Anne Chaisson.

The book is a sociological examination of the proliferation of affluent people between 25 and 39 who don't get married, instead forming friendships that take the place of traditional families. In the pic, a man attempts to subvert his girlfriend's desire to settle down by "discovering" this urban tribes trend and declaring it the new, hip alternative to commitment. She accompanies him on a research trip, bent on proving that his discovery is idiotic and he should marry her.

Kidd most recently directed the Laura Linney-Topher Grace pic P.S.