Blue balls is a slang term for a medical condition called epididymal hypertension. This condition occurs when prolonged sexual arousal without ejaculation causes fluid to build up in the testicles.

“Blue balls” is the achy feeling you might get in your scrotum when you get sexually aroused but don't have an orgasm. Doctors call it epididymal hypertension, though it's not considered a medical ...

“Blue balls” is the slang term for a real condition called epididymal hypertension. It refers to aching or painful testicles. Some people may experience this after sexual arousal that does not result ...