I've almost never gotten adwares on porn sites, but I got it on WP. I know for sure, because WP was the only page I was browsing at that time and it happened again and again, every time I browsed the site.
I got crap all the time from there. I also hit a lot of news sites and theirs get throught, too. A long time ago, I made a habit of cleaning out the box on every morning start up. I can almost always tell when something hits me, or tries to.
WP is one of the worst for spyware.