Right. That's a very good question and an important one to consider.
I echo the representatives from the Boys and Girls Club in feeling that youth need to be consulted about this.
As a reasonable place to start, we can look at what ages youth are able to consent to sexual activity more generally in Canada. That would be where I would recommend starting the discussion, but I do think it would need to involve other discussions with youth.
I do think that in most cases the youth are not consenting to have the image shared publicly. I don't think you would see very many cases where young people are saying “But I'm old enough to have this shared with my entire school without my knowledge”. It is important to discuss an age limit, but I don't think in reality it would come into play very much in the way this crime actually plays out.