Kiss Me, Kiss Me, Kiss Me! (1968)

Jean Novak, neglected by her brutal and alcoholic mechanic husband Stan, pursues affairs with other men. One of them is Stan's best friend Eddie, whom she falls in love with. When Eddie wants to break it off with Jean, she resorts to underhanded tactics to continue seeing Eddie by introducing Stan's unmarried younger sister Ellen, to Eddie and trying to break them up. But when Stan finds out that Jean is neglecting their three-year-old son for drunken binges and sex parties, he goes over the deep end and sets out to stop Jean, for good.