Hah, I had mine peirced for about four months, got bored and took it out. This was about 2 years ago, I can still put it back in. Well with a bit of pain. But then thats me, I peirced my own nose, ears few times..

I think that in some cases they like you to take out your peircings as during labour you move about and could damage them. Dont know, just what I heard.