Don’t put it on your sack.
Well if you choose to shave your sack then yeah you might consider an application - but instead go with “Code Blue” from Brave Solider
http://www.bravesoldier.com/code-blue.php you can put it on your neck, bikini line…and yes, I guess your “sack” - any place where you might experience a problem with ingrown hairs especially after shaving.
While you’re there at the site - no, not that site, the web site - get some Shower Shave too & some Friction Zone for both wetsuit collar and your taint for long rides; they make the best stuff!
Ian