The Impotent King (2005)

King Xian and his queen (who happens to also be his sister) have gone into hiding to escape rebels bent on pillaging the territory. This royal ensemble take refuge in a small town where they are given sanctuary by an old friend, Dr Wei. The king and queen are also having trouble in the bedroom as he is impotent; however, the queen is quite horny and enjoys taking strolls in the countryside where she is repeatedly raped by masked bandits. Meanwhile, the daughter of Dr Wei is determined to seduce the king and become his mistress