Having your period is obviously a totally natural occurrence.
But sometimes, having sex on your period can go totally wrong.
Maybe you forgot to take out your tampon before penetration, it got shoved waaaaay up your vagina, and you and your partner had to fish it out together.
Perhaps you didn't know you had your period until your partner started going down on you and their face was covered in blood...and they weren't really into it.
Or maybe you and your boo were getting hot and heavy in their car and you accidentally got huge bloodstains all over their seats.
There's nothing wrong with period sex, but it can cause some mishaps, so tell us: What's your period sex horror story?
Let us know in the comments below for a chance to be featured in an upcoming BuzzFeed Community post!
