If you think that a combination of Dr. Jekyll and Edwige Fenech is a sure indicator of something both naughty and messy, then prepare for utter disappointment.
Truth is that this film is not: (a) Horrific: Dr. Jekyll is a ludicrous and inadequate hairy dwarf; (b) Erotic: There is little/no nudity, and the sexiest thing Fenech does is to wear a pair of specs; (c) Funny. Unfortunately it thinks it is. Instead it is just risible; (d) Worth 10 minutes of your time.
The only value I extracted was interesting views of 1970s London, and a confirmation that the entire decade was a sartorial and cultural disaster. To be avoided at all costs .....