The Sweet Ride (1968)

An aging tennis hustler (Tony Franciosa), young protégé surfer (Michael Sarrazin), and young protégé musician (Bob Denver) live the buddy life at Malibu beach pad. Surfer falls in love with starlet (Jacqueline Bisset) who washes up on beach. Starlet is beaten up by her possessive producer/lover/sugar daddy after she has revenge sex with motorcycle gang leader. Motorcycle gang leader is in turn beaten up by Franciosa and Sarrazin. Main characters all grow up a bit. Music by Dusty Springfield and Moby Grape.