Evil Come Evil Go (1972) - Walt Davis

from wiki:
Plot
"Sister" Sarah Jane Butler, a hymn-humming religious fanatic who believes God has chosen her to cleanse the world of those who have sex for pleasure, seduces a bar patron, and guts him after the two leave together. Sarah then drives to Los Angeles, and lures another man to his death, scrawling "God is Love, not Sex" on a mirror afterward. While busking and preaching on the street, Sarah befriends Penelope von Prut, a naive lesbian who is being supported by her wealthy and ashamed parents. Sarah moves in with Penny, who she takes on as a disciple, and inducts into "Sister Sarah's Sacred Order of the Sisters of Complete Subjugation" by tying her to a bed, stripping her, and teasing her with a knife as they sing "Glory, Glory, Hallelujah".

Sex Psycho AKA The Demon in Miss Jones (1970) - Walt Davis

Quote:
If one had to pick the most shocking Sexy Shocker so far, it would probably be a toss-up between this perverted gem and the pecker-munching moment in Mad Love Life of a Red Hot Vampire. But this one's special. This one has a malignant perversity that's almost awe inspiring. A triple-XX porno horror comedy from the director of Evil Come Evil Go, it features an young John Holmes, a startling bit of graphic homosexual humping, and surprisingly gory violence.
Greaseball Nick suspects his wife of cheating on him. Nick goes out and buys a meat cleaver but, instead of hacking up Cassidy, he goes over to his girlfriend Eva's home and puts the meat cleaver through the neck of Jerry, Eva's “queer son-of-a-bitch” husband (played by director Walt Davis) who's right in the middle of having sex with Marshall, Eva's bi-sexual brother. Whack! And yes, kiddies, there's nothing quite like opening a heterosexual porn film with gurgling blood and a gay sex scene to totally wake up and disorient its audience. But, wait, it gets worse...