Seriously speaking, creating life hurts like hell, but no mother can deny the miracle of it. For me talking about it is serious bragging; I've made something so perfect with all of the power that is in my body (ok, the dad had something to do with it too, but it hurt him way less than me). I'm endlessly proud of my kids. The fact that it hurt to give birth to them and that it was yucky just makes a better story
Giving birth is all that a mother can brag about when it comes to a child, that's what we do. We can't very well start bragging about how good mothers we are or we'll get a mob of angry mothers on our tails who think we're either doing it wrong since we're not doing it their way, or the social services knocking on our doors.
*please notice the ironic tone here, I've discussed motherhood on many related forums, and it's a jungle out there

*