Zardoz (1974)

Somewhere in the distant future, all worship lord Zardoz, a humungous flying stone head who periodically visits Earth to check up on his underlings and spout statements involving the ills of the male anatomy. ("The penis is evil," Zardoz declares. "The penis shoots seeds and makes new life and poisons the earth with a plague of men.") Skeptical of his ruler's grand plan for abstinence, the sexually over-zealous Zed (Sean Connery) decides to stow away inside the huge noggin to learn more and soon finds himself within a vortex of mental giants called the Eternals. Intellectual eyeful May (Sara Kestelman) captures him for use in a research project, and things turn randy when this rogue arouses more that just scientific curiosity among the supposedly non-sexual female population. His hopeful hob-knob springs life eternal for these under-humped hotties.  Connery spends most of the film in nothing but a loin cloth, showing off his manly 70's bod!