Can I ask everyone who has them, to check their ball bags? If you can feel a lump other than the balls, go to your doctor to check them out for testicular cancer.
Ladies can have a little scrotum which isn't active, of course. There is a special name for the condition. I can't remember the name but one in a hundred thousand women have it, apparently. Take a closer look at your partner when you get the chance, guys.
It doesn't matter if you have one testicle or two, or none as most women, as a Seagull there is only one ball that matters...the one in the opposition's net!