Check yourself before you wreck yourself.
In all seriousness, testicular cancer is something you ought to get familiar with if you’ve got testes. It’s worth learning about and reminding yourself to check your balls every so often. You don’t need to become an expert, but at least learn what feels normal for your body so you can tell when it becomes un-normal and worth a doctor’s visit.
Obviously, testicular cancer is a BIG deal and there’s WAY more info about it than we can cover. Make sure to go do additional research, and talk with your doctor if you’re ever concerned!
While it’s not quite the same, it’s still worth a link: a while ago we did a comic on getting familiar with your breasts in the same fashion as this comic!