Draguse or the Infernal Mansion (1976)

Tasked to write erotica, an historian rents an empty house to avoid distraction, only to find it comes with its own muse which then proceeds to involve him in his own stories. The writer is commissioned to write an erotic book and starts to see perverted ghosts in the house he has rented. His journey goes deeper as he is lead into all the lustful and perverted secrets that dwell within.