The Beast and the Vixens (1974)

After a brief description of the legends of Bigfoot by the narrator, this film goes on to show what the hairy monster might really be doing with his time in the woods: watching women get naked and have sex. After spying on a couple of college girls sleeping together in a remote forest cabin, Bigfoot then stumbles across a couple having sex in the woods. After he chases off the man to have a little fun of his own with the woman, the film then leaves Bigfoot to follow the exploits of the two college girls as they encounter a troupe of skinny-dipping hippies who then have to fight off a pair of hardened criminals while avoiding the monster.