You wanna know something REAL funny? If this was to protect kids (it's not), it's going to have the opposite effect, BECAUSE they're relying on sites to do the checks.
Sites that were always legal will implement these checks, so your PornHub and XHamster will now be inaccessible to 13 year old trainee gooners. You know where they'll go? The sites that were bordering on illegality in the first place and couldn't give a shit about being 'double illegal'. Luxure. Motherless. This act ensures that, rather than kids gooning to some milf banging the plumber, they'll be gooning to hardcore scat porn and beastiality. Looking forward to seeing the absolute depravity that the next generation gets up to if this is how they end up spending their formative years.
In 5 years time we'll all be plowing hot 18 year old twinks who want us to roleplay as their incontinent grandpa and piss in their ass, and I'll be thanking the government for setting up this wonderful opportunity.