SAHEM62896 saidIt's a dull, primal ache. Not agonizing but it sure isn't fun.
Yes, an ache felt in your balls, and I've had it myself. Some medical experts claim the condition doesn't exist, but in this case I dispute them.
Blue balls usually follows a period of high sexual arousal, that does not immediately culminate in ejaculation. My theory is that various normal fluids in the male reproductive system are produced too quickly, and in such abundance without quick release, that localized swelling and pain occurs. I suspect the main area of congestion is the vas deferens, with the pain radiating to be felt in the testes.
These fluids are produced in various sites, to nourish and convey sperm cells. And younger men are known to produce seminal fluids in greater quantity than older men, and to be more easily aroused, in response to their higher hormonal levels. Hence it tends to be a young man's condition, seen much less often in older males.
And when I got blue balls, from too much foreplay that didn't conclude with sex, jerking off back home didn't immediately help, which masks the cause-and-effect of this. I presume the pain from the distention of the tissues doesn't go away in an instant, but lingers like many injuries do, even after the cause is removed.
Plus perhaps the congestion itself was still not totally relieved, it taking some hours for the entire reproductive tract to "equalize." The semen we ejaculate is expelled mostly from the prostate, not from our testes or the vas deferens, so a fluid surplus at those sites would not necessarily be instantly reduced by an orgasm.