Lyric discussion by sohaveaniceday 

hate to be crude, but do u think 'you'll hurt your knees' a reference the girl to offering him her, ahem, services. He's saying kissing her is enough, and doesnt want to take it any further as he oviously doesnt like her that way. Whatever its about, its heartbreaking.

I think it's more of holding one's self in the fetal position.

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