This movie is from the Alpha Blue Archives Young Lust Volume 1 boxed set. It seems to be a re-telling of the famous story Fanny Hill: Memoirs of a Woman of Pleasure, by John Cleland. Their description:
A young orphan comes to stay at a London bordello. After the big titted madam steals her virginity, lecherous johns abuse and molest her.
Cast: Carmel Monterey, Sandi Carey