Is it wise to discipline your child with the belt?

I have two issues with my child, one is he acted inappropriately at school and was playing tag. He was playing with three or four boys in the playground and his teacher said that they all reported that my child had tapped them down there by their parts and the kids thought it was part of the tag game but then he kept tagging them down there. Is my child trying to lean towards a gay tendency? I told him that behavior would not be tolerated anywhere at home or school and that the next time I would see that I hit him with the belt if he behaves innapropriately, since this never happened before i did not hit him with the belt but i told him i would make sure i did the next time. Was I too lenient or was it a good thing I warned him. I have talked to him about how gayism is bad and that that is disgusting. I believe strongly that God forbids such acts and I would like to instill respect in my child towards God and teach him so he grows up fearing God and to reject the bad. The bible does say however that u may hit your son with the belt. But I fear that he will grow up defiant and if you are permissive and nice to them all the time they still grow up disrespecting their parents. Is there a way to gear children lovingly in the right path? How would you explain the seriousness of their innapropriate behavior?