Define 'sexually explicit' as used in the new 2257 regulations?

Could they have found a broader term to use if they tried?

How / where do we draw the line when it comes to 'sexually explicit' content? What makes content 'sexually explicit'? Is there a method of testing whether or not content is 'sexually explicit'?

Your thoughts on this?

What one person may perceive as being 'sexually explicit' by definition, may not be to another person.

Regards,

Lee