That said, at 7yo, IMO it's a possibility that the kid might find that he like girls or maybe even both boys and girls as he gets older. It's hard to remember what it is to be a 7yo, but I recall that ideas were pretty open-ended and whimsical.
http://www.youtube.com/watch?feature=player_detailpage&v... (the profound effect that opera had on my tendency towards anthropomorphism is a whole 'nuther matter) And of the two Swiss sisters who babysat me at the age of 4, I had a definite preference for the younger, hotter one, despite the fact that her games weren't as fun. At the age of 6, there was a little girl who definitely had a crush on me and it wasn't at all yucky. She was way too overt about it, though, and brought down the wrath of the playground upon us (and destroyed my ant farm, dammit). She moved away by 3rd grade, only to come back sophomore year in High School. I came over to study once, walked upstairs and saw her mom naked, then spent the evening watching Handmaid's Tale under a blanket and studiously not sleeping with her because, dammit, she was still too needy - for whatever reason, I just wasn't attracted to her. What kind of weird teenage boy passes up sex on a Wednesday? One of my friends later slept with both of them at once. Mother and daughter moved to Florida and contracted Lyme Disease, last I checked. A male friend made a pass at me in 6th grade; we had a mutual friend who had invited him to go to his parents' cabin and the two of them had had sex in the hot tub. The idea seemed really pretty revolting to me but I wasn't mortally offended like I should be so I kinda wondered if maybe getting over the revulsion was just something you did eventually (never mind the fact that the bra strap of the girl who sat in front of me was the majority of my attention that year). He's happily married with four kids now. I started to internalize just how straight I was when, at 16, I looked over at my best friend's ass in jeans and found myself thinking "his ass would look great on a girl." Then at 17 I got a great deal on a bright yellow ZX-1000 Ninja with Yoshimura pipes and a 230mph speedo. Simply sitting on the stupid thing made me feel so masculine that I decided the whole dilemma was bloody ridiculous. I blared The Cure and pranced around like a little girl. So much of our identification of "gender" and "masculinity" is external and peer-driven. My sexuality has been atomic-clock constant since my first boner. I have a cousin, on the other hand, that would rediscover her lesbian tendencies every two years like clockwork. She finally married the most effeminate man I've ever met and they have two lovely children. Some people figure it out early. Some people never do. So long as we're all happy, what does it matter?
It's an odd thing how much some sort of chase plays into attraction. There have been two girls in my life that I had no good reason not to date, but for the fact that they were obviously interested in it from the beginning. I guess it's the equivalent of that safe guy friend that so many girls have. He's hopelessly into her, she knows it, and that's where it stays. I've been that guy, btw. So very lame. So long as we're all happy, what does it matter? I've long wondered at people that get hung up on other's sexual preferences. It seems such an odd place to push your personal opinions. One can't help wonder about the inner struggles of people that have strong opinions on the matter. Why else would you care?