A threesome becomes a foursome in this sensitive drama. The tale begins with the relationship between a recently divorced man and woman (from different marriages) and the bisexual they get involved with. At first all three are happy in their new arrangement, but then the divorced fellow suddenly leaves and those remaining in the relationship become quite tense. Fortunately the fellow returns with another, more conventional fellow. Eventually the three persuade him to join them.
Unfortunately the movie Why Not! is not yet available on HBO Max.
| Directing | Coline Serreau | Director |
| Writing | Coline Serreau | Scenario Writer |
| Production | Michèle Dimitri | Producer |
| Sound | Jean-Pierre Mas | Original Music Composer |
| Camera | Jean-François Robin | Director of Photography |
| Editing | Joëlle Hache | Editor |
| Editing | Sophie Tatischeff | Editor |
| Art | Denis-Martin Sisteron | Production Design |
