URINE HE'D HAVE HIS UNDIES DOWN OR OFF
Unless he's using the underware to masturbate with. And semen can stain yellow on occasion. If he's in or past puberty then it is most likely a semen stain.
A non masturbatory option, if he sleeps in his underware he might be having wet dreams which would explain the semen stains.
Spots left on material by the products of male ejaculation. After someone has masturbated and successfully ejaculated, he may leave the semen in his underwear. This will cause a stain, known as a wank stain.
Taste it lol
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.
Semen stains are usually white in color. Seman stains can sometimes hold a unique sheen when held under a regular light. Occasionally semen will also stain yellow, depending on the fabric and on the man's diet.
You could, but depending on the stain it may just make it worse. I would wash them with a stain remover or bleach.
It just looks like a wet spot or stain.
HAHAHAHHAHAHAH No that would be a skid mark or a SH*T STAIN. go wipe your butt you nasty little person.
You can't, be prepared to rock those white stains on your favorite hat and shirt!
You wash them. That stuff shouldn't "stain" I'm old, and I've never seen that.
Juices from the vagina. It is normal to see the stains. If they become yellow, then she has got a yeast infection.
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
This will be a bit awkward to answer but here goes. Your wondering if your girlfriend is cheating because you noticed some stain in her underwear. Why are you insecure about your relationship with her, did she gave you some idea that she is doing it? And why in a world you have to look at her underwear. Now here's the reality, and I'm not sure if you know this facts about women. Stain can be cost by discharge before or after her period. If the two of you have a sexual relationship, it will leave your girlfriend some stain. Try not to panic because your girl's underwear has stain. Remember man are different from woman.