When it’s genuinely important that a man not glance to his right before a plot-critical knife-wielding assassin can strike, only one thing will do. No, make that two things, both of them breasts:

a chilly brunette bares her breasts to a man in a suit while a crazy dude with a knife lurks behind the door

Image is from the 1962 sexploitation movie Surftide 77, which got a promising capsule review in the Fall 1964 issue of Focus On magazine:

The recent Hollywood sexcapade, Surftide 77, proved that comedy can serve as an excellent vehicle for presenting nudity, sadism, fetishism, and transvestism. The story concerns a private eye who is hired by an old woman to find her niece who is about to inherit a fortune. The only way to identify the niece is through a butterfly birthmark on her left breast. After stripping many beauties, the detective finds the right girl, only to discover that old lady who hired him is really a man who wants to kill the girl!

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