You can break a penis: There are no bones in the penis, but it can, in fact, become "broken." Doctors refer to the injury as a "penile fracture," and it's every bit as harrowing as you'd imagine. (All right, so if you're going with the whole pickup line angle, you might not want to start with this one.)

"[Penile fracture] is a severe form of bending injury to the erect penis that occurs when a membrane called the tunica albuginea tears," explains Hunter Wessells — chair of the urology department at the University of Washington School of Medicine. He continues:

The tunica albuginea surrounds the corpora cavernosa, specialized spongy tissue in the core of the penis that fills up with blood during an erection. When the tunica albuginea tears, the blood that is normally confined to this space leaks out into other tissues. You get bruising and swelling.

So how does a penis actually, you know, break? According to Wessels, any form of vigorous intercourse when the penis is rammed into a solid structure... "during sexual acrobatics," for instance.