Fourplay (2001)

This romantic comedy deals with the fleeting attractions between men and women. When American Ben (Mike Binder) arrives in London to become a writer on a well-known sitcom, he never dreamed that he would end up in a complex love quadrangle. Sitcom star Carly (Mariel Hemingway) is married to show producer Allen (Colin Firth). French make-up artist Fiona (Irene Jacob) is single, as is Ben. Though Carly quickly develops a crush on Ben, she decides that Fiona would make him an ideal wife, and proceeds to push the two together. Ben falls for Fiona, but she and Allen are developing a deep, intellectual attachment. The question of the day is who will end up with whom!