Porn isn't speech, bit torrent downloads aren't speech, and cybersex isn't speech.
Speech was originally intended to protect political and social commentary. That is of value to society. Porn, piracy and cybersex are not. We can survive just fine without them.
I realize this is an unpopular opinion on the internet, because (a) the internet has a daytime TV audience since September 1996 and (b) people like to believe their lives have meaning when they're crusading for "freedom" of some kind, even though they're just pushing out bytes on a screen on social media sites.
However, I think we need to stop worrying about what they do in other countries. We have no proof that legal porn/cybersex leads to a better way of life. We also have zero proof that banning it leads to banning of actual speech, i.e. political/social commentary.
Unfortunately these debates always become so emotional that soon it's children screaming at anyone who endorses anything but "do whatever you want, wherever and whenever, without consequences."
It's like a religion, but not an interesting or creative one. It's very much about the ego and not at all about the sacred. The sacred might emphasize a purpose in life beyond freedom/porn/cybersex, and it seems most people fear that, even if in non-religious form.