Why does my boyfriend get brown stains in the front of his underwear?

Guys, Why does my boyfriend have white stains on the outside of the back of his boxers only on the top of the waistband (pics)? - Sexuality

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How To Get Underwear Stains Out Easily

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Mens' Sweat-Resistant , Stain-Resistant Boxer Briefs With 6 Ply Highly Absorbent/Water-Proof Integrated Front-To-Back Panel Style # BU100

Everything You Need to Know About Vaginal Discharge

My husband always has a 'brown' spot in his underwear, he says he wipes himself well, but he has small 'accidents.

Why Your Vagina Leaves 'Bleach' Stains in Your Underwear

About Those Mysterious Stains on Your Pants

Bleached Patches On Your Underwear Are Perfectly Normal, Vagina Museum Explains