Nekromantik (1987)

Sharing a mutual fascination for the dead and the macabre, the Berlin misfits, Betty and Robert, are in for a big surprise that will soon broaden their horizons, when Rob takes a job as a cleaner at an aftermath clean-up agency. Little by little, right under everyone's noses, the obsessed new employee amasses a rich and grotesque collection of severed limbs and human organs, and what is even more fascinating, their dreams will finally come true when Rob brings home a putrid cadaver to amaze his girlfriend. Nevertheless, can Robert handle this bizarre and gruesome ménage a trois?