We cannot provide medical information but you want to know the mechanism of blue balls?
Here is the mechanism of the regular stuff:
Step 1. During sexual stimulation,
parasympathetic nerve impulses from the sacral portion of the spinal cord release the vasodilator nitric oxide, causing the arteries leading into the penis to dilate. This causes increased blood flow into erectile tissues. At the same time, the increasing pressure of the arterial blood entering the vascular spaces of the erectile tissue compresses the veins of the penis, reducing flow of venous blood away from the penis. Consequently, blood accumulates in the erectile tissues, and the penis swells and elongates, producing an erection [
point].
Step 2. Culmination of intense sexual stimulation--->
sympathetic nerve impulses contract smooth muscle--->peristaltic contractions in testicular ducts, epididymides, vasa deferentia, and ejaculatory ducts.....rhythmic contractions in bulbourethral glands (
fluid that lubricates end of the penis), prostate gland (
secretes an alkaline fluid that helps neutralize the acidic components of semen and enhances motility of sperm cells), and seminal vesicles (
secretes alkaline fluid to neutralize acidic semen and contains nutrients, etc).....rhythmic contractions in erectile columns of penis---> semen moves into urethra---> increase pressure causes semen to forcefully expel from urethra [
shoot]
{information from an undergraduate textbook of human anatomy and physiology}
Take Home Message: Clean your pipes or massage your balls after step 1 if there are no willing and able partner for step 2.