Best way to stop him is just to change your clothes-washing habits.
Any underwear that needs washing....straight into the washing-machine, and door closed tightly. Or into a closed dog-proof dirty-washing container.
He's doing it because your scent is really really interesting for him of course. I don't think it's worrying, except if he was to swallow any material/elastic/etc....and of course it's not good for you to have to keep buying new underwear!
i always put them away when i wash them and what not. its if i'm with my husband and....they come off..umm, unexpectedly. i guess i just have to take a minute out of our special moment and hide them from him? argh!!
This is easy when husband about dont wear any knickers.Im sure he would be very agreeable to that. lol.
LOL I'm sure he WOULD be very greatful :)