A 3D-printed penis implant has restored erectile function to rabbits and pigs in a world first. Pigs with damage to their penile tissue that received the one-of-a-kind surgery not only achieved erections, their rates of successfully producing offspring increased from 25 percent to 100 percent. The penis has one of the most complex vascular network structures in the human body. For years now, researchers have been working on a model of the corpus cavernosum, the spongy tissue of the penile shaft, that could help those with erectile defects. The recent study by a team from China, the US, and Japan...