How long does it last, and is there anything I can do to get rid of it faster?
"Blue balls" (testicular vasocongestion) usually goes away by itself in just a few hours. It goes away faster if you masturbate to ejaculation, because this relieves some of the pressure in your reproductive system. The condition is relatively harmless, although if experienced many times throughout life it could possibly contribute to prostate problems in later years. That's why it's a good idea to masturbate to ejaculation if you're uncomfortably aroused. (Read more about testicular vasocongestion)