You'll be surprised (or maybe not) how much a penis can take and not be less for the wear. (not that I'd personally know about such things, of course)
You'll take a great big strapon but you won't take a tiny little sound?
It kind of looks like the underside of an outhouse toilet.
One does have to be careful when it comes to kicks, punches, and hard object impacts to balls that are tied up or otherwise constricted, since it's easy to do lasting damage to the sensitive structures inside. From what I've read, the safest way to do impact play on the balls is when they're hanging freely between the legs.
Personally, I can take more punishment to my cock than my balls. Pain from impacts to the balls is different than other areas -- a hard kick or punch to my balls results in excruciating pain that emanates up through my lower abdomen, which can last for many minutes. I do like sensation play on my ballsac (i.e. -- teeth, pointy objects, hot wax, etc.) or some squeezing, pulling, twisting and moderate slapping.
