Yes. It's caused by temporary congestion of blood in the scrotum. The medical term is testicular vasocongestion, but in the locker room you might hear it called "blue balls," since your scrotum can take on a bluish tinge. It goes away naturally in an hour or two if you stop being aroused; if you ejaculate it usually goes away much faster. (For more, read JackinQ&A – Questions About the Male Body.)
What do you think about when you masturbate or have sex? Would you tell your significant other if they asked?
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When I'm aroused for a long period of time, my testicles start to ache. Is this normal?
