I think when i first read it (I would have been around 15 myself) I found it a bit shocking but it didn't colour the book for me. It was about love - they all loved each other. Perhaps I'm naive, I don't know, but that's how I felt.
Agree with this. Some scenes only work for me in the written word. You could call the It orgy gratuitous or unnecessary, and I found the "use" of Bev misogynistic, but I do think Stephen King is very good at writing children, and there didn't feel anything much inappropriate about the sex scene, aside from the fact that it was a sex scene.
However, seeing it on film is just...ick. It's not fair to expect any of the children to do it, at all, and I don't think there's a way it could have been filmed which would have been anything other than exploitative. They shouldn't endorse seeing the actress who played Bev as a sexual object, either.
Also thought it was actually grosser that Patrick offering Henry a blow job was the yucky representation of how horrible Patrick is, yet all the Losers Club having sex with Bev is...pure? Good? Yuck, anyway.