X + YY: Formel des Bösen
- Jier: 1970
- Lân: Germany
- Sjenre: Crime, Thriller
- Studio: Brünnstein-Film
- Keyword: exploitation, playboy, serial killer, hormones
- Direkteur: Pavle Jovic, Teja Piegeler
- Cast: Ljubiša Samardžić, Kai Fischer, Miloje 'Mića' Orlović, Albert Hehn, Leonina Pavlović, Stefan Zessner
