The banning of some of those acts is insane. As others have said, if it's legal to be done in your own home then two consenting porn actors should be allowed to do it on screen.
I believe to opt out of the porn filter, you are required to contact your internet provider (Virgin, Sky, BT) and request the filter to be removed. But as Mommyjogger has pointed out, I'm not sure what happens after that, is a password required etc?
There ways and means around it. It is very easy to set up a proxy and have banned websites unlocked anyway. All of the torrent websites are banned and cannot be accessed (UK, not sure about other countries) but a simple proxy enables the user to bypass all of this.