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your son isn't actually masturbating to ponies. he gets turned on by there character he knows from the show doing something sexual.

this is actually a good thing. it means that he shows urges of being sapiosexual (being attracted to someones mind rather then the body).

this usually results in a kind person who's not shallow.

if he where to masturbate to furry porn it would be a bit different. usually if someone watches furry porn he/she is attracted to the (ooh I don't know how to explain this in plain English but I think this comes close) associated characteristics of the animal and the face etc, giving it like a mind of it's own. that idea of the mind is what turns them on.

just let is slide, do not mention it to your son and do not try to start a conversation about it. it's nothing to worry about.

the best thing a parent can do is accept his child whatever strange things he/she does and not judge him/her (unless he start's doing criminal stuff etc).

this will build a good relationship that will last.

ooh and about rule 34: it's a rule from 4chan that states "if it exist, there is porn of it" so somebody made a website where you can find porn of almost everything (yes even paperclip porn, milk carton porn, number porn (that has a psychology name but I can't remember it atm), etc, etc, etc)

ooh and btw. someone who masturbates to mlp porn is called a "clopper" and there are quite a lot of people doing this (and unfortunately a lot of them express doing so openly)