This is actually the plot of the book IIRC. Pennywise can't become the fears of adults because they're too abstract, so he preys on children. Which is what leads to him being defeated by a child orgy
Woah, woah, woah! The child orgy helps them find their way out after defeating ol' pennyboy the first time and getting lost. The power of friendship (and some help from Gan) is what does the trick. Let's get our fictional facts straight here.