It’s known scientifically as epidydimal hypertension
https://www.healthline.com/health/mens-health/blue-balls
Basically, the blood flows to the penis and testicles causing everything to enlarge. The pathway for ejaculation is also prepared by expanding and producing fluids. If you don’t ejaculate this pressure can last for too long and cause physical pain. The testicles may also show a blue color due to the excess blood. The pain eases after relaxing for a while, but ejaculation is the fastest way to relief.
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