My bellybutton has been pierced for over 6 years...and my ler LOVES playing with it...and sneaking her fingertip or tongue into my navel!!! If she is playing with the piercing, I know I'm in for it...
Back in the day there was one girl I'd get to tickle from time to time who had a peirced bellybutton for a while. Honestly, it seemed more trouble than it was worth. She'd always snag it on something and hurt herself to the point where she didn't want anyone playing with her belly. Ultimately, she got rid of it because she'd get hurt more often than she'd get to show it off.
Well my ex had hers pierced, and she was deathly ticklish, so either yay or nay, I dont care, in the end its her body, if she wants to have her belly button pierced, its her choice not mine. As long as she's still ticklish afterwords!! Haha