A feeling with some of these books.

So I just got this thought from a video about shotacons, Lolicons, or whatever they call themselves. I'm not really going to judge anyone for what they read (depending). I just really want to understand how people can read a book and enjoy it when the characters that look like children are being put in sexual predicaments. I understand that it's fiction and it may not make a difference to reality. I'm just a little confused about how people don't get that uncomfortable feeling. I mean hey maybe they just don't think about it or maybe I'm just thinking a bit to into it.