What does it mean when you find small bloody stains in your boxers after sex? ?

[JS2011]

I recently had sex and afterwards I put some boxers on and woke up the next morning, when I went to get it the shower, I noticed small bits of blood in my boxers?! Please help.....

 

[Elliott]

She was on her period dude. Gross I know!

 

[Barcode1]

See a doctor for a medical evaluation.

 

[YahooUser1]

maybe the girl was on her periods