It is not the job of government to police who is and is not allowed to look at porn on the internet, especially not from the party that likes to portray itself as the "unobtrusive small government" party. Stupid moralistic nanny state attitudes like this should have died out years ago.
To be honest, I'm more worried that this is just another step towards full on internet censorship. Start with porn and terrorism to make it hard for anyone to oppose it and speak out against it (and unfortunately it seems to be working), and when those powers are established it gets extended to "extreme" or "unacceptable" content which could very easily include political and current affairs content.