(I put this in this section because this isn't a debate so much as just a discussion)
I have 3 boys - 1 girl.
Boys: 11, 9
My older two sons never showed interest in particular girls, still don't - they're autistic in various degrees. They talk about girls in general as 'pretty' or saying things like 'when I get married...' but they've never said anything like 'she's pretty' or 'I like this girl at school' and so forth ...
But my youngets does not have autism and he (age 3) shows extreme interest in other girls - not just little girls, like his age. But teenagers and women, especially (Angeline Jolie and Marina Orlova) are his big comment-inspiring woman on tv, for example.
In fact, I hear more from him about such women than I do about friends his age or even teenage girls and such - and I don't know if I should deal with him, as he grows older, in the same way I dealt with his brothers or if I need to address things earlier, or read a book first. LOL
I've asked my husband and he said it didn't matter until he gets older - which isn't sufficient for me. I'd rather be prepared far in advance.