We Real Cool Steaminess Rating

Exactly how steamy is this poem?

PG-13

We wonder what these boys are doing until "late" at night, and we're curious about exactly which "sins" (5) they are celebrating. But Brooks isn't going to give us any more than clues and innuendo. You might be able to push this up to an "R" rating if you bought the interpretation that "jazz" (7) is a slang word for sex. Brooks has said this wasn't what she meant, but that she doesn’t mind if people want to take it that way (source).