Porn Holocaust (1981) - vintage film

The expedition arrives on a tropical island. They are looking for traces of a strange humanoid. In the course of the film the head of the group fucks a woman on the beach. A humanoid is watching them from behind the bushes. The assumptions of the team leader are justified. While the satisfied man was away, a hefty Negritos with an ugly face and with a giant penis kills men, and rapes a woman.