A seaside vacation home serves as an aphrodisiac, tempting the unsuspecting family staying there into a variety of amorous entanglements. First, 19-year-old Laura takes a boyfriend who rides a motorcycle; then, her 17-year-old brother stokes the affections of his best friend, Martin. But things only get more complicated when the old flames of parents Marc (Gilbert Melki) and Béatrix (Valeria Bruni Tedeschi) show up.