Madame de Sade: She Beast in Hell (1986)

I will devour every last drop! A shock beyond imagination! A drama of extreme perversion.

A man is kidnapped by his ex-girlfriend on his wedding day and sexually tortured. When his fiancé finally runs into him after three months, the man realizes he can no longer perform sexually as before, as he's been "broken" and turned into his ex-girlfriend's sex slave.