You're wrong on #2.
Porn sites do NOT spread malware. Maybe at one time they did, but not any more.
I have an anecdote to prove my point (this is the internet, after all)
A guy brings in his computer it has a virus. He's sure the kid has been doing "naughty" things on it and got it infected. Digital AIDS as it were.
I fixed the virus and did an "audit" of the PC's surfing history and searches and so on, giving me a timeline up to the point where it got infected.
The kid was indeed surfing porn. I asked the guy when he and momma went to bed. "10:00" he said. I told him I could tell. Little Johnny was surfing for "hot milfs", "Zoo porn" and other horrible things starting at 10:30. But the virus didn't get downloaded then.
The virus got downloaded at 7:30 in the morning when the adult got on the PC and did a google search for "TV Repair in [local town name]" and followed whatever link was there that took him to a fake antivirus driveby download.
In other words, Bestiality? Safe. TV Repair? Not safe.
I have other examples too, such as malicious ads on PBS kids and Drudge report and so on.