Trick is to NOT trim it down to perfect clean shaven. Leave some small tiny little hairs. It won't itch. Been doing that exact thing myself but I'm not willing to prove it.

YMMV if your crack hair is harder than mine.

And if you work out, the sweat just makes it all slidey back there ++ungood.

sure to use some powder or some shit

For the love of god, if your skin is irritated, do not use shit to try and fix it.

/s