Teeth (2008)

"Teeth" is a 2007 horror comedy built around the vagina dentata myth, following a teenage girl who discovers her body has a violent way of protecting itself. Jess Weixler plays the lead, and the role called for her to move between scenes of teenage awkwardness and outright body horror. The site holds 3 scenes from the film, including nude and sex scene footage where Weixler bares all as the plot turns bloody. It's the sequence people land on this page looking for, given how the story ties her nudity directly to the film's twist.