Isn't that title bad ass? How can you say no to a movie title like that? Pretty much all giallo films have intricate and alluring titles like that. Here's a list. Go ahead and check it out. I'll wait.
Unfortunately, Your Vice Is A Locked Room And Only I Have The Key is another in a long list of films that doesn't live up to the expectations of the title. Sure, there's some nude table-top hippie dancing, and a satin sheet-filled lesbian romp, and multiple stabbings, and a cat named Satan; but it's kind of boring. What would be really great is if some of the motorcycles in this film knew karate. Now that would be a movie!
I know that sounds fairly random, suddenly talking about motorcycles that know karate and such. Just relax, and wait for the punchline.