Tarzun and the Valley of Lust (1970)

Tarzan as Edgar Rice Burroughs wished he could have written him swinging from tree to tree while swinging with blond jungle beauty Jane and a buxom native girl who just can't pass up a bulging loin cloth. But that pesky gorilla keeps trying to mooch in on Tarzan's action, and this time Jane might have no recourse but succumb to the hairy primate.