I heard about this and I so doubt it.
Really.
He's not Motley Crue for heaven's sake.
I doubt seriously he was just hooking up with chicks backstage at 16 years old. He's got so many managers and people around him. I doubt they would turn the other way while he lost his virginity to a 19 year old.
I'm not a Bieber fan, but I think this is a case of Bieber Fever Gone Astray.
I could be wrong, but I don't think so.
I personally wouldn't be bragging about nailing a 16 year old boy no matter how famous he is.
I think it's a sick grasp for attention.
It will be solved by a simple DNA test either way.
For now, I don't believe it.
Just my opinion.