I have one other suggestion to add to your testicle sun protection selection a couple weeks back: how about leaving a little hair down there? I see more and more bald balls about that may be a bit more shielded from the sun if they were left with a crew cut, and then shaved completely after tanning. I know this isn't a failsafe anti-burn method, but one that seems to work on the scalp — so why not the scrotum?