Porn is already censored to an unnecessary and unnatural degree since the 2014 Audiovisual Media Services Regulations were introduced, which bans UK-based producers from showing, amongst other things, an uncontrollable and natural reaction to pleasure in women. It also bans a lot of other acts which are both legal and regularly engaged in by a pretty high number of people. The UK's obscenity and extreme porn laws are hugely outdated and bear no relevance to current moral standards, or with recent case law. Censoring porn in the way that the government are now suggesting they'll do (the 2016 Digital Economy Bill) will also significantly compromise the privacy and potentially the identity of people, by storing personal information in insecure databases. It's also unnecessary. Pretty much every study that's been done that says porn harms young people is full of bad data and warped statistics with regards to reporting in the mainstream media.
It ignores the real issues: we don't teach sex ed properly in schools, so children aren't aware of the issues that surround porn, while at the same time are more likely to actively seek it out to fill the gaps left by their education; at the same time, it frames them as undiscerning consumers who need protecting, when research has shown that they are able to think and critically evaluate the material they're watching; it fails to protect small businesses, who are still major contributors to the UK economy but cannot function should further censorship come into place; these business often cater to minority or marginalised or stigmatised groups, from trans/queer communities to BDSM practitioners, where porn can be used in an activist sense to create communities amongst these groups of people or by others as part of self-exploration and identity cohesion.
If you don't like it, don't watch it. But don't impinge on others' rights to do so. It's bad for individuals, communities and the economy. The UK porn industry in total is worth over £1bn (this figure is lower than in 2014, before the regulatory act was introduced), and a great deal of that is from small, independent companies. Censoring porn is a pointless, expensive exercise which masks deeper-run societal issues as a result of a few people in power going, "ooh, I don't like this." The money could be far better used elsewhere. The NHS, maybe?
Most of this comes from
Myles Jackman and Pandora Blake's evidence to the Digital Economy Bill committee, which is aiming to increase porn censorship at the moment in UK Law. If you like something more legally heavy, it's a good read.