I wonder if this French will apply online too
 

Skinny models will be legally required to provide a doctor's certificate under new French laws | Daily Mail Online

If it goes to online too, then in theory it 'could' apply to porn.

It may be that French porn sites may need medical certificates to prove models they shoot are healthy as well as stating if your content is photoshopped.

This is more about eating disorder, not so much about being "healthy".
I think it's a good idea, it's a shame that the fashion industry didn't take matters in their own hands. :2 cents:
As for the photoshop thing, I'm pretty sure it applies only to magazines or "health" and fashion blogs / sites.
No one would give a shit if someone removed pimples and stretch marks on a boob on a threesome shot.