There's not cartilage at all. It's just a connective tissue. Like, you still need some mobility, and cartilage just doesn't provide that mobility. It's too hard. But what can cause you to break is something called a penile fracture, but it's not the fracture like in the way of breaking a bone, because technically there are no bones, but you can definitely break something when you are erect. And for example, like, you're entering, miss the hole, bam, slam right into them, or she's on top, misses the hole, bam, slams right on top of you, you know?