During the early ’70s, as censorship began to slacken on movie screens around the world, Hammer Films, the leading purveyor of gothic horror films, began to add copious quantities of sex and violence to their productions. This one, which pretty much states its intent in its title, is a very wild entry in the cycle, in which the debauched nobleman Henry Jekyll (Ralph Bates) transmogrifies into the libertine Sister Hyde (Martine Beswick).