When we say 'fiction' what do we really mean? Because I've seen the word 'fiction' being utilised in here like 'all for one' term. There is historical fiction, there is romance fiction, crime fiction, adventure fiction, child fiction, fantasy fiction,erotic fiction..so let's take a pit stop at erotic fiction shall we? Erotic fiction is written to elicit arousal. It's main purpose is to make something 'erotic', whether it's the expression of sexual arousal of the protagonist, or whatever, the main point is to to 'eroticise' an event.

There is a difference between crime reportage and crime fiction in relation to murder.Yes murders do happen, or there are fictional descriptions in crime novels all over the place.
It's factual. It's not written using words and overrall language to promote eroticism in the act itself. Anyone with one foot in the real world can see that and not confuse the difference and be humble enough to concede to that.

Crime fiction/reportage is never written in an erotic context -for sexual arousal or to be used as 'masturbatory fodder'.

In relation to rape and underage girls(or boys) and this being eroticised?

I think there is no place for that. When people begin to say 'yes this is acceptable', I believe there is something really 'up' -whether it concerns their morals, psyche etc - there is something amiss. The reality is to be aroused with such subject matter, when a girl (or boy for that matter) is not fully sexually developed emotionally or sometimes physically, points to other issues. To sit there and eroticise something like rape amongst 'young' girls or boys,which is an act of violence,is like taking a step back into the period of De Sade, regress to an era where personal values were severely lacking. But that's my personal opinion, and yes I'm sure there are differences of opinion about this.

So before people 'debate', at least get their definitions correct as to what type of fiction they are referring to and the 'audience' that the 'fiction' format is targetted to. Because the 'fiction is fiction' phrase doesn't really clarify anything and more or less 'skirts' the subject matter/topic in question.