Promoting a sexual performance by a child is a sex crime, and as
> > generally includes the promotion of lewd
> Well, yes, but then it comes down to what you consider to be lewd.
No, it comes down to what is the proper definition of lewd within the
context of such a law.
Ok, so it comes down to what a reasonable person considers to be lewd.
(At least in the UK, there is no set definition of "indecent", it's up
to a jury.)