Yep. Maxim had an absolutely horrifying article on it about 15 years ago. I still have night terrors about that article.
It can happen during sex if the girl is on top and it...uh...slips out. Hit just right it can bend and break, just like a straw. Apparently there is a treatment for this, but the author of the article I read didn't ask about it, he was too embarrassed. It took months to heal and there was...ah...structural damage. When he finally did go to the doctor, he was told that he should have come earlier.