The Lustful Amazons.

In medieval France, traveler Pygar tells he-man Karzan (Maciste in the French version) of his recent journey to a place called Antigua, and of its entire community of Amazons promising undreamed of sexual satisfaction to any man who comes upon them. More importantly, Pygar tells of a fortune in gold. Karzan/Maciste, is persuaded to undertake the journey in search of riches, unaware that Pygar is in collusion with the Amazon Queen to actually deliver Maciste as a slave stud to help rejuvenate the race.