[Thanalie]

I'm looking for the title of a movie I saw on TV as a kid (in the late 1970's) I can only recall a few scenes... I think it involved a murderer who made wax figures of his victims (but this part is unclear to me).
What I do remember, is a peculiar scene where a woman is laying on a couch, unconscious. A young man sees her and removes her panties. He then wrote a message like "f*ck me" on a piece of paper and place it next to her (was it on her chest or on a table next to her?).
The movie was in color, and the style was more of the 1970's... So it could not be "A Bucket of Blood".
I hope this rings a bell!
Please let me know!
Thanks.