Nattlek (1966) aka Night Games

Buy this dvd at www.sddfilms.com. On the night before his marriage, a young man and his fiancee return to the castle where he grew up to find out why he is impotent. In flashbacks, it is shown that his aristocratic mother indulged in nearly every sexual perversion known to man: orgies, incest, and so on. He and his fiancee blow up the castle, and she helps him begin a more normal life.