At some point later in the years, the kid will probably stumble onto some hardcore porn, but if you contextualize it properly, he/she will understand that its not how real relationships work.
In the same way, its ok (and probably good) if your teen tries weed/alcohol under your supervision, with the proper education around it, but you aren't going to give your kid like a heroin injection just because he/she is curious. But the fact that you establish trust and educate your kid about drugs that he/she will certainly come across is the more important bit about them staying away from harder drugs. Instead of outright ban, and then kid discovering how good weed makes them feel, and then going out and trying harder drugs.
Like I shouldn't have to explain this basic concepts to people. Really makes me worry about all the parents raising their kids these days.