One of the things I’ve noticed in a lot of adult fiction, is that authors tend to have their characters swear way too fucking much. Now, I’m not opposed to swearing. I think that it adds flavor and personality to dialogue that would be missing otherwise.
The problem is that it’s overused. Like with exclamation points, using the word “fuck” over and over again dilutes the message you’re trying to portray. Now, there is an exception to this. If the character is a potty mouth, then it’s fine. But having all of your characters swearing like sailors all the time? It just makes the words mean nothing.