UPDATE: More from Recapped:
You see Katie’s breasts from various angles. The scene is dark and blue and there is a lot of stylistic editing — slo-mo, speed up, blurring.
http://www.recapped.com/celebrity-nudity-rumors-april-6
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According to Recapped.com, Katie Cassidy (Arrow) and Ashlynn Yennie (The Human Centipede films) have nude scenes in The Scribbler:
"Nothing from Michelle Trachtenberg in The Scribbler but Katie Cassidy is topless during a sex scene. Also, Ashlynn Yennie is naked in just about every scene she’s in."