I don't believe it.
All anime avatars watch loli and pig fucking chick.
As others are saying, I suspect it's learned behavior. Exposure leads to desire, and years of watching anime and visiting shitholes on the internet lead to desires like loli, horse fuckers, and pig fucking chick.
I'd say the only way to avoid it is to either stop watching wank material - although if you watch anime, that'd be a pointless battle you're bound to lose - or to get involved with some religious or philosophical system that condemns wankery, in hopes that it'll give you the strength to go back to the natural order of things - although historically, repressive systems seem to lead to even
weirder fetishes, as starving men and women will latch on to whatever scraps of sustenance they can find. You could also try chopping your balls off, or just going out into the desert to spend the rest of your life meditating a lot? That's what people did before the internet; don't know if it worked, but it seems to have been popular.
Personally, what I've always wanted to see is someone coming up with a way to drive fetishes into
positive channels. Like, convince people to get really turned on by studying, or by making healthy life choices and exercising regularly.
"oh god, yeah! That housework looks so hot! I can't wait to grab my broom and sweep up all the dust in the kitchen!" etc etc. Maybe if we keep going like this, and the social norm becomes lazy, body-positive fat people who fap to loli and throw tantrums on Twitter all day, then living well will become so taboo that it'll seem really sexy and exotic?
I'd get if they were a playboy banging whores or something, but these people aren't doing that. They just sit there and mastrubate in their bathrooms.
I mean, they sort of are, though, aren't they? They aren't banging whores, but it's sexual release, and they've got tons of fantasy partners. Wanking may not be as pleasurable as 'real' sex, but it's more pleasurable than
not wanking, and once people realize they can do it all the time without consequence, that's the end of it.