Restrain Potion

Restrain Potion will lower one's libido by 40 points.

These are also used by the Lizard Tribe within the Shrine in the Ruins. Speaking with Rhot will give you an option of "Something for the curse." and you can give him one.

(Editor's Note: I think that supplying potions of varying kinds affects a stat I remember seeing about the Lizard Tribe, a Lust stat for the Males and Females. Through multiple actions in the story, you can adjust their lust Up or Down, essentially saving or corrupting them. I think offering 1 restrain potion will lower the libido by 1.)