Not that I have noticed. I will not pretend that I deliberately look at what is on other people's screens, but I have not seen anything. So if someone is looking at smut in public, but no one knows, what harm is being done ?
Is Cameron going to announce that people must not read playboy in a public place ? What would be the point, it is not a problem, so why fix it ?
Oh: I see, this will appeal to those Torygraph & Daily Fail readers who have not yet come to terms with their own sexuality or have their minds infected with religious memes, so he will garner a few more votes. Others, like me, will soon forget this stupidity. On that basis I doubt that it will become law.