See How They Run

[LostInTime]

Article

Bertrand and Elizabeth Lannier (Jacques Dutronc and Charlotte Rampling) are obliged to abort their plans for a week's vacation at the Le Touquet resort. Bertrand, a prosperous real-estate agent, feels stale and world-weary.
[...]
He's infatuated with his young, black transsexual secretary, so Elizabeth, on a whim, invites a casual acquaintance, Julie, to share her vacation. She's a single mum who (unbeknown to Elizabeth) once had an affair with Bertrand.