Why is whiplash rated R?

Related questions

1. Why is the NIN rated R?
2. Where is whiplash set?
3. What type of injury is commonly associated with whiplash?
4. How much money did whiplash make?
5. Is Whiplash based off a true story?
6. Is Whiplash a musical?
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Tags

1. #including
2. #whiplash
3. #language
4. #rated
5. #strong
6. #references
7. #sexual