First off, you're giving them more advertising. I'm new at steem and didn't even know they had a NSFW section.
Secondly, after reading your post I went to see how bad was it, as you said "pedophile ring". I was expecting by a serious pedophile ring, like a group trying to catch up kids or whatever. Instead, I just found photos from models who might be underage (there are many "petite" porn stars that look younger than they are).
Let's agree with you and say they're not 18. They don't really look younger than 15. And if they're 15-17, you can't really say it's pedophilia. The laws make you believe it's pedophilia, but if you read a lot, you'll find out that pedophiles aren't interested on teenagers. They're interested on toddlers and kids being 10 years old at the most.
There are a lot of scientific reasons that make a man be interested on 15+ years old girls, even back in the history it was really common for a 30 years old man (which used to be an already "old man") to marry a 14 years old girl. The actual reason behind being illegal to have sex with an underaged is most likely because people believe that a 15 years old can't decide if they want to have sex or not, and that older guys can cheat them just to have sex.
But let's be honest, most of 15 years old girls and boys nowadays, and even right now, are sending nudes and masturbating at snapchat and many other apps. There are also a lot of them who are doing it live at facebook. Most of 15 years old are already having sex, too. I've read news from 13 years old couples that met at school, had consented sex and became parents.
Times change, and "our kids" aren't kids anymore. They start to think of sex before you can imagine, and they see sex everywhere, even those "feminists" and "activists" who protest nude are a sex reference for them, and along with TV and Internet, they're helping for sex and nudity to become normal for them. And I don't think that's wrong.
Also, before you start to think and say I'm a pedophile, I'm not. I'm 21 years old, and yes, I sent and received nudes when I wasn't yet 18. Most of my friends did, too. It was really common to "trade nudes" with people I met on internet when I was 15, and it's even more common today, we owe that to the lots of hormones being released in our organism at that age. And yeah, they were real persons and not pedophiles. I still talk with most of those I sent nudes to, even met a few in real life.
I agree, Steemit isn't a place to post this kind of stuff. But it's not as bad as you're saying, to be honest.