Frankenstein: Italian Style (1975)

Dr. Victor Frankenstein creates a monster to show his scientific theories, but soon leaves him. So the scientist tries to rebuild his life getting married with Janet, and retires to his castle with Igor. However the monster comes back to haunt Frankenstein, and so Victor finds out that the monster has ferocious sexual orientation to Janet. Frankenstein then calls the servant Igor to readjust the monster, but also Igor takes advantage of Janet...