Do boys wear jewelry?

So today was Abigail's first day of her last year at Nursery school. It is called "Grande Section". We just refer to it as the 'big kids' class'. Since the big kids went only for a half day today, we got on the metro line at 13h. And directly across from us sat a twenty-something couple. She: shorts, halter top, long mermaid-like hair, necklace, and a tatoo on her shoulder. He: low jeans, tee-shirt with a torn neck, shag haircut, and... a necklace.
Abigail stared at the two of them. I let her go. She is a very attractive child, most people don't mind if she looks at them. And these two seemed utterly involved in their conversation so I don't think they even noticed her. I watched her stare for a few moments, then mused to myself about other things. About 3 stops before ours, they got off. Abigail turned to me and said, "Do boys wear necklaces?"
I verified that I had heard her correctly. She insisted, pointing this time as they left the subway car. I told her not to point... stare, OK; point, no way!
Then it all added up in my head -- the stares, the concentrated looks... she was trying to figure out some things. Probably, Abigail wondered, 'Is that a boy? His hair is kind of long...' (it is 2010 and small children STILL think that girls have long hair and boys have short hair) and then, 'Hmm, is that a necklace?'
And I don't think Abigail had ever seen a male human with a necklace, so it was clearly breaking up some presuppositions for her.
So when she asked, I answered her, 'Yes, boys do wear necklaces.' Not being one to accept such a simple answer, Abigail retorted, 'But Daddy doesn't wear necklaces.' Quite true. And it was hard to keep from laughing... um... scientist with necklace. There's an image...
Anyway, I insisted that some boys do wear necklaces. She seemed appeased.