You've heard the warnings on the Viagra commercials saying that if your erection lasts longer than 4 hours you should call a doctor. Well, in this piece, MSNBC explores prolonged erections, known as priapism. These ultra hard-ons don't come from being turned on and they don't go away after you orgasm.

They occur when the penis fills with blood, as in a normal erection, but for some reason it's unable to get out. Apparently they're extremely painful, and really do need a professional's attention. A doctor will drain the blood, either with a needle or surgical shunt. Ouch. Thankfully they're also pretty rare, and almost never related to ED pills. Sore super-penises usually come from injections (another solution to ED), blood diseases, spinal injuries or reactions to non-ED medications.

The flip side of priapism? Clitorism! The article says the condition is extremely rare in females, but we know that ladies do get clitoral erections, so it stands to reason that they might also suffer from excessive engorgement. A quick Google search for clitorism shows that the term is out there, but not much has been published about it. Has it happened to you? Do you know anyone who's had a never-ending clit hard-on?