Madame Zenobia (1973)

Beautiful, but sad and dejected young widow Marcia is unable to find sexual gratification with her fiancé Eric because of her continuous love affair with her deceased husband John. Eric insists that Marcia stop with this peculiar spectral fling or else it will destroy their relationship. Marcia's wacky swinger friends take her to see powerful spiritual medium Madame Zenobia in order to rectify this problem.