Realistically, youngsters do not own hifi the like of which we discuss here. When they do get old enough to aspire to it and might want to discuss it they are of an age when not only do they know all the words they probably practice them among their peers to a far greater extent than is typical for us.
Yes, anyone can come here by typing the address , or by link, but so too can anyone come to a porn site or say, the sweary Viz comic site ( which is largely peroused by teenagers). There are not normally blocks to entry other than a weak little disclaimer on the home page. But I find it highly unlikely a very young person would come here, find it interesting and bother to read it. Besides , if we are talking about children here, it would be normal for some filtering software to be present or at least parental supervision, which would block access in the first place.
In any case, like I say they use the words anyway. They are not going to be sending emails to their friends saying,
"Ooh gosh, look at that site - they said these rude words. It's really cool. You can take part in some cable arguments too if you like, but the main thing is the words are really really naughty". No, of course not.
I suppose that part of the reason to come to a community like this is to to be able to let your hair down, just as you might at a gentleman's club or having a game of sport with your friends. Realistically, when we are being funny, we often invoke the naughty words to give it more bite. Also for those who feel constrained in their free use nornmally, it is a release.