Sometimes, what can't be detected by the normal ball check can be discovered by checking your cum. Yes! A perfectly legitimate reason to take your boner in hand and stroke one out.
So, go ahead, grab your cock, work up that hard-on, pound that pecker. Instead of covering yourself in cum,
blast the bulk of your jizz onto a surface where you can inspect it for traces of blood.
If there has been no recent trauma to your balls - blood in the semen can be an indicator of testicular cancer. If you see tiny streaks of red or pink, or if the semen is tinged with pink don't waste a minute. Grab the phone and call your doctor. Now, go point and shoot...