El mirón (1977)

A discontented husband and his jaded wife learn the joy of cuckolding in the peep-tastic Spanish shocker El Miron (The Peeping Tom) (1977). Roman (Héctor Alterio) is a middle-aged man who feels hopelessly inadequate next to his young, beautiful wife Elena (Alexandra Bastedo). But rather be consumed by jealousy, he lets her have sex with all the young studs she wants...as long as he gets to watch. We also like to watch here at Mr. Skin, and if you get your kicks from snooping, too, then the many surreptitious soft-focus shots of Alexandra's boobs will get your Tom turgid in no time.