Question: Why can't Borateem be used on men's unmentionables?
Lots of options, here.
"Air" the fabrics outside for several hours. I expect they've been folded, so be sure to unfold and "fluff" fluff them into piles, enabling the air to circulate around them.
Am sure there will be some residual aroma. In that case, separate the lights from the darks, and make two respective wash loads of the fabrics. Be sure to include a Color Catcher in each load to mitigate color bleeding. Wash on a gentle cycle or regular cylcle (your preference), using your regular detergent / soap and my personal preference, Borateem Laundry Booster
http://www.borateem.com/
I've used Borateem for decades in place of bleach when washing colors and anything other than men's "unmentionalbles". Borateem won't damage the fabric.
If the first round of this process doesn't work...repeat the washing cycle.
Here's hoping your friend incorporates her new "stash" into some lovely projects.