Before Viagra, Cialis, and Levitra, which are as responsible as mini-DV cameras and hot girlfriends for getting more guys into the adult business, many porn dudes would inject Caverject directly into their penises.
You can't say that doesn't hurt.
In addition, from this picture (and you know that the models involved probably didn't know their image would show up on an erectile dysfunction site hawking boners), it appears that Caverject makes your spouse bigger than you are. Why fight ED with a drug that makes your dick seem smaller?
Caverject is recommended for men for whom pills (or "other devices", the website says ominously) have failed. The final image shows a long-nailed hand holding the penis during the injection. I think this image should be called "Castration Anxiety".
See also: Caverject