Underwear fetishism means that some people feel very excited or happy when they look at or touch underwear, like panties or briefs. It's like how some people feel happy when they see or touch puppies or toys. However, it's important to remember that everyone has different interests and things that they like, and this is just one of them. It's absolutely okay to have your interests and be respectful of others' interests too. Just like we all like different types of food, different colors, or different games, some people like different types of clothing. But it's important to always be respectful of our bodies and other people's bodies too.