How do Porcupines have sex?

Very carefully, I was told many years ago.

I just learnt this is not the case at all.

According to Professor Uldis Roze of Queens College in New York: "The female lets the winning male know that she's ready to mate by arching her tail over her back. Because there aren't any quills on the underside of her tail, she can't wound her suitor. And because the male doesn't have quills on his underbelly, he can't hurt her."

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