See if any donation centers take unsavory items like used socks and underwear. Some actually do. My place sells them dirt cheap to scrappers who sanitize them, grind 'em up, and use them as filling for cushions, teddy bears, and the like. That way, it's never the end of the line. Maybe that will help with your decision.
It was easy for me. A girl-friend of mine (as opposed to a girlfriend) who typically doesn't wear panties, was all about taking my used underwear.