Quote Originally Posted by bad-one View Post
Male rats don't have nipples, I just double checked my adult hairless boys and couldn't find any

I'd say it's possible for a rat to be a hermaphrodite, but far more likely she is infertile or your male is shooting blanks.

Pics of the the rats underside would be helpful
His definitely not shooting blanks his other girls have dropped 21 babies between the two. I had him in with the girl in question and another female at the same time for 3 weeks they both should have been pregnant if she was fertile correct? The other females babies are almost 2 weeks old.