Gebissen wird nur nachts or 'The Vampire Happening' -

release date	June 4 1971
studio	Alpha Video Distributors
director	Freddie Francis
writer	Karl-Heinz Hummel, August Rieger
starring	Pia Degermark, Thomas Hunter, Yvor Murillo, Ingrid van Bergen, Joachim Kemmer
tagline	The Adult Vampire Sex Comedy!
trailer 1	Trailer #1

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Synopsis

An American actress inherits a castle in Transylvania. What she doesn't know is that her ancestor, the Baroness Catali, was in actuality a vampire countess, and emerges from her tomb to ravage the nearby village and Catholic seminary.