S.D.
At his age who is going to make fun of him? Later, he might have to decide if he likes it enough that it's worth the little pricks in school that will inevitably make fun of him. But, it will serve him well if he wants to be in theater later on. The guys I knew in middle and high school who got the leads were good dancers (we did a lot of musicals). And, for the record, not one I can think of who was a lead in a musical was gay. None of my gay friends did theater! And, the only guy I can think of that came out after highschool was the quarterback :P
Just remember, most famous actors started when they were young and most of them went through musical theater in school to get where they are now!