Although it occurs very rarely, it actually is possible to break your
penis. However, this does not happen in the way you might think.
Normally, when we speak of someone "breaking" a part of their body
such as an arm or leg, what we are talking about is a bone breaking. There is
no bone in the human penis. When it is in a flaccid state, you can no more break
the penis than you could break an ear. With enough tugging, you might cut,
rip, or tear it, but it wouldn't really "break."
However, when it is erect, the penis becomes quite hard. Three tubes (known as
the corposa cavernosa) fill with blood and become almost as hard as bone.
Should a man do something that would exert a great deal of sudden lateral
pressure on the penis, one or more of these tubes can break (actually,
"rupture" is probably the more appropriate term). The cases in the
medical literature which report this are almost invariably caused by a woman
trying to jump on top of a man and missing her target. Ouch.
If you are worried that you might have done this, all I can say is: You would
know! The event is accompanied by a loud "popping" sound, severe
sudden pain and horrible bruising. You would need to seek medical attention
immediately. Unfortunately, this damage is difficult to repair, and men to
whom it happens often experience some internal leakage whenever they become
aroused, preventing full erections. Luckily, it is a very rare occurrence.