With such a wide range of genetic features across both genders, I don't think we can make hard and firm statements/rules as to how a "man" should move as opposed to how a gay man might move. For that matter, not all women who are big in stature and heavy in body (notice I did NOT say fat!) can be considered any more gay than the 5' 1" woman who weighs 98 pounds soaking wet. God loves wonderous variety!! Look around.
Now, as to the effeminate boy. My now 17 year son was a sickly child and got knocked out of doing a lot of "manly" stuff when he was 9 and continuing forward almost to today. About the time he turned 11 he created "Stephanie". Stephanie was his evil alter ego and she was very feminine. Son didn't have a smart mouth, but Stephanie did. If something happened in the house, son hadn't done it, Stephanie had broken it but was afraid he'd break a nail if she tried to fix it. Stephanie tried on his sisters shoes and paraded around the house in them. Stephanie had discussions with his older sister about the guys she dated. We occassionally called Stephanie by name. Sadly, Stephanie died somewhere around the time Son turned 14 or so. It was a great loss of sarcasm in our household. And her development didn't make my son one step closer to being gay than taking karate (and winning at sparring) makes my daughters.
Luke, people worry to much about hom*sexuality. Sin is sin. It's not gonna matter one iota more that a child becomes a hom*sexual when he is grown than if he becomes an adulterer. Sin is sin. We all commit them, and we all get forgiven the same way no matter what that sin is. And if we don't get our sins covered under the blood of Christ, it still won't matter what particular sins we commit. We'd be destined for hell simply for saying a cross word. All have sinned, the Bible says. But it doesn't say that those who commit x, y or z are going to be worse off than than those who committed a, b or c. So take a deep breathe and let the children develop into what God would have him to be. You might just be surprised at what God has in store.