No, with good hygiene this should not happen.
Pubic lice also sometimes leave small dark brown specks from their own excreted matter on the parts of the patient's underwear that cover the anal or genital areas.
Yes, condoms can sometimes leave a stain on underwear. This is usually caused by the lubricant or spermicide on the condom. To minimize the chances of staining, you can wash the underwear in cold water as soon as possible after getting the stain.
there are no traces of him so far in Canada.
Thailand
if it is a wet one lol
purse, wallet, underwear,
You are expected to leave on your underwear when you receive a massage.
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.
Either way is common.
You leave your underwear on.
Graphite leave clear traces on paper, wood etc.
sometimes they leave you money, and sometimes just good wishes.