Not all countries and beliefs find the pleasuring of another human to be an offense. It is only often in strong social influence, that the "do as I say, not as I do", and pretending to agree to things because others believe that is something that may be a source of conflict, is this even an issue. (Which is most political bullshit countries, who thrive off of misinformation.)
Why keep it? Well, if only for the fact that others know it is "A reality that can happen", or "So others can relate", but mostly to learn and control, as desired, as humanity spent thousands of years trying to do, through education of "reality", of which, this is, as is, the reality of murder and death and rape and theft and drugs and general abuse and obviously sex for pleasure as well as this fictitious thing called love (Which is a romanticized illusion per individual, sustained for the benefit of personal gains by another. Love = I want that, this moment, a lot, and may kill to get it or keep it, even if it kills me, unless I find something better to want tomorrow.)
The internet is nothing more than a giant library of information. Something all nations support, though some only allow "censored" information to be available in what they "pay to share", the internet is paid for by us, not them. It is our library and should be allowed to be stocked with information we find relevant to share and discover, for whatever reason.
This is not some freedom of information crap, this is "you don't have to understand, but don't interfere", stuff that goes hand in hand with "you don't own this fucking world, no-one does".
Those who wish not to inform others in their society should remain within walls, censoring the food they feed their slaves. They should not be crawling out of those walls, telling others what to do, who they have no actual care about, or interest in, other than disrupting their lives, for personal bullshit karma.
That is how all wars start. All of them. That is how humanity retards itself, causing eminent demise and devolution, instead of contributing towards its constant expansion, awareness, understanding and evolution.
Don't be part of the pack who keeps humanity, including kids, dumb in the dark, then bitch about them not having the knowledge and information they need to live and love.
That is why nothing should be illegal, but why everything should be regulated. (Regulated = existing in a safe environment, where reduction of harm can actually be assisted. As opposed to being illegal through prohibition, which does nothing but encourage and cause harm to those involved, on both sides of the fence.)
Murder isn't "illegal"… We have wars all the time. We kill prisoners. We kill each other accidentally without reprimand, allowing many crimes of compassion and love… That is "regulation". (Which still needs work.)
We allow rape and prostitution, it's called marriage. Many wives don't want sex, or husbands, but have no real defense for denial in a marriage. They are not told that they can "say no", and thus, don't… and when said, it is rarely ever enforced legally.
Rape a "minor", get life… rape an adult, get a few years, maybe, if she was even able to identify you, or alive, or wasn't blitzed out of her mind on drugs and alcohol, and a nympho-maniac… That is degrading to adults, and sending a wrong message to children… once you are an adult, you are just fucked, enjoy your suppression of sexuality under the protection of ignorance, then fuck-it, you're 18 now… go get raped! (Oh yea, that's what people do in bars, parties, anyplace you are caught off guard, and acting over-sexed, like we made you to be… by starving you of sex… Welcome to child safety!)