X + YY: Formel des Bösen
- Godina: 1970
- Country: Germany
- Žanr: Crime, Thriller
- Studio: Brünnstein-Film
- Ključna riječ: exploitation, playboy, serial killer, hormones
- Direktor: Teja Piegeler, Pavle Jovic
- Uloge: Ljubiša Samardžić, Kai Fischer, Miloje 'Mića' Orlović, Albert Hehn, Leonina Pavlović, Stefan Zessner
