As a certified health coach, I work with clients on taking care of their hygiene and self-care, and those private parts are surely included. For both men and women, it can become problematic if you re-wear unwashed and dirty underwear for two or more days, as you’re exposing your genitals and groin region to different types of bacteria that could trespass through your skin. Plus, as there’s likely to be more sweat and moisture down there, it can make it even easier for you to be affected by dirty clothes, Dr. Michael Reitano, physician in residence at Roman, a men’s healthcare app, tells Bustle. To prevent any dangerous or uncomfortable conditions down there, be sure to swap out underwear daily, and even after you’ve done something sweat-inducing, such as working out. Here are 3 things that could happen if you don’t change those undies enough.

1- Reitano says that it’s possible to get some not-so-great odors down there when you’re re-wearing the same underwear for two or more days at time. Because there is discharge on the underwear, it lingers on your body and gets further moistened as you wear them throughout the day. As a result it can lead to foul smells.

2-As you’re wearing the same dirty undies, and you’re exposed to different odors and discharge, it can also make you sweatier, too. “[Y]ou’ll find more moisture in the groin areas,” says Reitano. So, be sure to bring fresh underwear with you if you’re going to be in a sweaty situation (or if it’s time for a change).

3-If you don’t change your underwear, it could lead to some nasty stains that accumulate as you use the bathroom more, which you certainly don’t want around your groin area. There’s “possible staining from incomplete (or not absolutely perfect) cleansing after a bowel movement,” says Reitano. “Though, staining is more common in men due to increased perianal hair.” No body’s perfect, but to make sure the spots you missed don’t stick around, change those undies.