Penises can break.
You probably won’t want to know this, but a penis can actually break, despite not being made of bone. Vigorous intercourse or masturbation—or even falling on an erect penis—can cause a penile fracture. It’s a bending injury that occurs when a membrane called the tunica albuginea tears. The tunica albuginea is what surrounds the corpora cavernosa, which is the spongy tissue inside the penis that fills up with blood during an erection. When the membrane tears, the blood that’s normally confined to this space leaks out into other tissues, causing bruising and swelling. Recovering from a fracture usually involves stitches.