Heisse Nächte auf Schloss Dracula (1978)

A newlywed couple is lured to Schloss Schreckenstein, the residence of Count Dracula -- condemned for all eternity for sleeping with his grandmother. Soon, the bride, Eva, is under his spell and is taken away to be the center of an orgy. The apparent purpose of the exercise is to fill her up with semen before the Count takes a bite.