Sexuality in general isn't a good topic for public debate, as it is highly personal, highly nuanced, and few people even want to touch the nastier issues related to it, because it gets BAD. When nobody is getting hurt, it's nobody else's business, but when people are getting hurt, just knowing about it can damage people's mental health. At the risk of getting banned, I'll point out a few of the things that nobody wants to discuss, for good reason.
Seriously though, I'm personally quite upset with the vast quantity of pornography available online, because I feel strongly that exposing children to such sexual material (don't pretend it's reasonable for anyone to be able to keep them away from it) has a serious negative impact upon their development, speaking as someone who was once a child on the Internet.