After the male has finally approached the female and sniffed her all over, especially her nose and genitals, he rears upon his hind legs and walks towards her, usually with a fully erect penis. If the female is not ready to mate, she runs away. If she is, she, too, will stand up on her hind legs and walk towards him, and they will rub noses. He will then drench her in urine. Understandably, she reacts by grunting, striking out with her forelimbs, trying to bite, and shaking off the urine and running away; however, if she is in the peak of heat, she objects less strongly.
When the female is absolutely ready to mate, she gets down on all fours, raises her tail and, if the male is not already ready, begins backing into his head and nose. When the male is ready, he rears back on his hind legs and walks into her. In this position, the quill-covered underside of the female's tail is in contact with the quill-covered belly of the male, so no one gets hurt. Also, the male doesn't attempt to hold onto the female but instead stands on his hind legs (sometimes with help from his tail) with his forelegs held high above her.
Copulation is vigorous and continues from 2-5 minutes. Afterwards, the female will try to copulate again, and the male will oblige until he is tired. If the male is separated from the female, they may go at it again after they are reunited. A few hours after copulation, the female is no longer interested and behaves aggressively towards the male. Activities like rubbing the genitals on objects, etc. continue for a few weeks but quickly lessen in frequency and intensity.
The overall result is that about 7 months [3] later the female porcupine may give birth to one baby, which thankfully for the mother is born with soft quills.[/quote}