One for you and two for sharing? For balls that painfully slap around, a cock ring can hold them in place. For balls that painfully suck up into the pelvic floor... a cock ring can hold them in place!

And for non-committal erections, cock rings keep your blood where you want it: in your cock. Starting with the largest size, try them all to find the perfect fit. While flaccid, slide both the scrotum and the cock through the ring. Do not combine with erection-enhancing medication (or a nurse may have to saw this off you).