Nothing except they need washed
If a man puts on underwear after recently ejaculating, then it is likely that such a stain will be left. If a man ejaculates while actually wearing underwear, this will also leave a stain.
If a man has a yellow stain in the front of his underwear, it typically means he has urinated on himself. However, it also could be a sign that he was aroused.
in your underwear its a stain frome your farts
Of course not
what idiot wears a condom under his underwear?
Cuz when we get turned on, a little stuff comes out of our penis. The only way for women to stain their underwear is if they crap or pee in it. That is usually unlikely too
Lemonade
no
u suck on it
Poo
Taste it lol
A yellow brownish stain in a girl's underwear means that she will be starting her period ina couple of days so be prepared so that you won't end up with a bloody mess in your underwear and maybe on your pants.