Autoeroticism is when someone touches or performs sexual activities on themselves to make themselves feel good. Just like how you might like to cuddle with your teddy bear or play with your favorite toy, some adults also like to touch their private parts to feel good. It's important to remember that this is something that should be done in private and not in front of other people. It's a natural and normal thing to do, but it's a private matter that should only be done when you're alone.