"Flesh for Frankenstein" scarcely qualifies as horror -- the gore (originally shown in 3D) is too ridiculous to take seriously. Rarely has a film strained so hard for excuses to flaunt slimy, bloody internal organs for shock value. The scare-minded viewer also has to contend with Arno Juerging as Frankenstein's assistant Otto, whose bulging-eyed reactions are a dependable guffaw.
As for the story itself, the main twist is that Frankenstein (the inimitable Udo Kier) has created a male and female simultaneously and hopes to mate them. And as with the contemporary "Rocky Horror Show," these humanoids are ideal physical specimens rather than ugly monsters. The brightly lit, two-level laboratory even resembles Dr. Frank-N-Furter's lair in the "Rocky Horror" film.
Other prime characters include Frankenstein's lusty sister/wife (Monique van Vooren) and her beefcake servant (the ever-wooden Joe Dallesandro, offering his usual furrowed-brow scowl and out-of-place Noo Yawk accent). And if you think the wriggling livers, intestines and lungs are grotesque, just wait until you see the armpit-slurping love scene between these two.