Several little girls staked their claim on my son in 1st and 2nd grade. He liked one back in 6th grade but now has no interest again. They talk about it a lot in 4th and 5th, by 6th the girls are acting on their crushes and most of the boys(few exceptions might be the scary/needy ones) really act on being a boyfriend no earlier than 9th grade. I had a student tell me the other day that he was never going to be a boyfriend, he was just going to 'have sex.' I let him know under no uncertain terms that I thought his plan was unacceptable, dangerous and innapropriate for us to discuss further. Watch out for THAT guy too!