3. "Silence of the Lambs"
Even with Observe and Report in the running, Ted Levine's twisted simulation of femininity through a scalped wig and creative tucking is hands-down the least sexy scene on this list. And it's not technically "full" frontal. But it's an unforgettable, one-of-a-kind image, unless you count Kevin Smith's homage with Jason Mewes in Clerks 2.
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