As far as I know they have some restriction on some material yes, but mostly on illegal content only, like child pornography and real beastiality, they also have restriction on some porn actresses who did porn when they were less than 18 years old.
Quote from the site:

Code:

No true rape 	
No snuff or serious body injury 	in live action content.
No zoophilia 	Furry and animated bestiality is allowed.
No .exe files except porn games 	Check for malware before uploading.
No underage content 	18+ years old only, no exceptions.