This is exactly what will happen if you don't wash your underwear.

How often should you wash your underwear - one in five people re-wear dirty underwear

I Tried Period Underwear, and Here's What Happened

Is it actually unhygienic to wash underwear in the washing machine or just a cultural thing? : r/chinalife

How—And How Not—To Wear Your Underwear

What To Do With Old Underwear: 13 Eco-Friendly Solutions – WAMA Underwear

Cleanliness expert Jolie Kerr tells Elle how often we should wash bras

Here's what happens when you don't change your underwear every day

Here's what may happen if you do not change your underwear enough - Times of India

What If You Didn't Change Your Underwear For One Year?

How Often Should You Wash Your Bra—and What Happens If You Don't?