This is a prescription drug that goes under the brand names Caverject, Edex, and Muse. This is a liquid that can be injected into the penis, resulting in a hard, nearly immediate erection. It can also be taken as a urethral suppository. Typically used by the medical profession when an erection is needed, such as when testing whether a patient has a physical erectile dysfunction versus psychological, or when the penis must be hard for a surgical procedure. The injectable form often comes in a syringe with a short needle, approximately 1 cm in length, so the user doesn’t have to be concerned about what depth to penetrate.
This same drug is given to newborns with the blue baby syndrome, in which blood vessels around the heart aren’t formed right. Prostaglandine E1 expands their blood flow until surgery can be performed.
I had a fuckbuddy who I saw off and on for about a year. Her best friend had an older regular bf who had to use Caverject prior to any sex with her. One time my fuckbuddy and her friend watched me jack off. Knowing about the girl friend’s bf having to inject his dick to get hard, I wondered what was going through her mind as she stared at my rock hard prick as I ejaculated for them.