She Killed in Ecstasy (1971)

Dr. Johnson (Fred Williams), a young doctor with a burgeoning career, is researching human embryos using animal cells. When he brings his research to a medical committee for approval, his work is deemed inhuman and his lab is destroyed. Tramautized by the ruling and the demolition of his work, Dr. Johnson commits suicide, sending his wife (Soledad Miranda) into a panic spiral of her own. One by one, she seduces the comittee member and kills them during sex. 

Director Jesus Franco depicts these erotically charged kills in graphic authenticity. Professor Johnathan Walker (Howard Vernon) is one victim of Soledad's seduction, and we see it all—down to his balls. The aptly named She Kills in Ecstasy (1971) is dark, dangerous, and well, pretty damn sexy.