Yeah I read "It" of course. But I was 16 or so. I often heard about the orgy but I really can't recall it. Maybe it was censored in the localized book or I did not perceive it as that bad as people make it. AFAIK it was after they defeated the spider being in the sewers. King still did substance abuse when he wrote It and surrounding this debacle I often see people accusing him of still doing it though he is clean and dry for decades now.

Yes the scene may have been inappropriate but it certainly wasn't meant to be pedophilia:

"In 2013, Stephen King (through his office manager Marsha DeFillipo) shared on the message board of his official site what the controversial scene in the sewers represents, and begins by explaining that, at the time, he wasn’t thinking of the sexual aspect of it. Instead, he wrote it as the connecting link between childhood and adulthood, as the Losers Club knew they had to be together again, and described it as “another version of the glass tunnel that connects the children’s library and the adult library.” King added that he's aware that, with time, there has been more sensitivity and attention to issues like the underage sex depicted in IT's sewer scene."

https://screenrant.com/stephen-king-it-beverly-sewer-scene-meaning-explained/

What I find way more disgusting is the lynchmob behaviour of people in this thread who never read anything from King and don't know him in general and them even accusing other users of being pedophiles.