This case is exactly why we have judges instead of computers to render justice. It requires discretion.
The boy did something that, at least in my opinion, went beyond "horseplay". He didn't just smack some girl on the butt or give someone a "wedgie". He put his naked butt on someone's face. That is a little disturbing and requires punishment.
Having said that, to brand the kid a sex offender for the rest of his life is crazy. Put him on probation, have him do some community service related to bullying and that should be the end of it.
When I was that age this type of behavior would of been considered homosexual in nature. Nobody would do this unless they were a pervert. When I read some of the comments from people who see this as nothing, I wonder about them.
The judges don't have discretion anymore thanks to the knee-jerk laws passed by yahoos. The judge said as much here. What discretion is left belongs to the fascist prosecutor. I'm sure he'll tout this as a great victory for "the children"!