It may seem a little weird and creepy when your dog licks your worn underwear furiously after you inadvertently leave them within his reach.
Don’t get creeped out, though. Your dog is just acting as a normal dog should.
Dogs don’t care about your sex. They like licking male and female worn underwear just the same - as long as it’s their owner’s or somebody else they like.
Your dog licks your underwear because he has a fantastic sense of smell - and your private areas also happen to have a lot of concentrated strong smell on them.
Your worn underwear has had some time to catch some scent from lots of pheromone-producing apocrine glands present around your private areas and armpits.
It’s quite common for dogs to lick and sometimes eat worn underwear, socks, or other sweaty items you wore all day. Dogs can pick up on the strong smell, and they simply love it.
The best thing you can do to prevent your dog from licking your underwear is merely being aware of where you leave them.
The strong scent on your underwear may be more potent after sweating, peeing, having sex, or if you are menstruating or pregnant. Pay more attention during those times.
Try placing your worn underwear (and other clothes) inside a hamper with a lid.
Remember, your dog is doing dog things.