Absolutely not. Sure, there's some stuff it would be better not to see here but once we start banning content that fails to gain our approval, where do we stop?
You can begin with something sacrosanct, like child porn, that almost everybody agrees is an evil, but what follows from there? We'd end up with all kinds of political and religious censorship that would be untenable.
We can all use our own discretion about what we view, but the problem comes with kids and teens who are impressionable, rebellious, and fascinated by all manner of so-called "adult" material. It would be nice to protect them but I just don't know how that's possible, despite the best efforts of their parents.