I think if that bothers you, a browser extension is the better option.
For the simple reason that whilst you may feel uncomfortable with such articles, others are perfectly fine with it and enjoy reading them.
And since, as point rightly pointed out, porn sells, it'd be a waste of opportunity for mobile nations to not tackle the subject, specially when porn is evermore consumed through mobile devices.
If you're a parent who is concerned about their child reading the article, parental controls on anti-virus software normally allow for a few censorship options in terms of website access so you might also want to check there (since there it's considerably harder to turn off the protection whilst a browser extension can just simply be uninstalled).