Top Sensation (1969)

aka’s: The Seducers/Sensations/Swinging Young Seductresses

Aboard a luxury yacht in the Mediterranean, a rich socialite (Maud Belleroche) plays sex and mind games using a young couple (Rosalba Neri and Maurizio Bonuglia), a gold-digging prostitute (Edwige Fenech) and her own mentally disturbed son as pawns. Things get out of control, resulting in murder when the yacht stops at an island populated by shepherds. (In English and Italian language, with English subtitles for the Italian language sequences).