I agree that if you son pursues ballet seriously, he will likely encounter a signigicant number of gay males. However, he will also encounter a significant number of straight males. Yours and his goal should be to look at ballet strictly as an art form, rather than some activity that will decide his sexual orientation.
I agree that this is probably not an appropriate site for your son to access. If you really want a good site which focuses on all aspects of ballet, including the concerns of young male dancers, try danceart.com. [/i]