Arabella: Black Angel (1989)

Beautiful Arabella is an insatiable nymphomaniac with a crippled writer husband, Francesco, who is unable to pleasure her. Instead, Arabella searches for lovers in elicit dens of debauchery, bedding an endless array of men. However, when her husband discovers her having sex with a stranger in their shed, Arabella panics and kills the man, only to discover that her sudden act of violence arouses creative inspiration in Francesco. Covering up the crime, Francesco asks his wife to further explore her sexual fantasies and report back on her experiences. Unfortunately, Arabella’s lovers are subsequently visited by someone else… a vengeful murderer who violently castrates them…