That seems like such a myopic statement. Does that mean that all who pirate, likely consume a lot of porn? Or all who facilitate piracy - i.e. TPB, etc. - also serve porn?
I know of many private piracy sites/groups that explicitly forbid dealing with porn, but the quality of their releases is unparalleled.
Both groups are on the margins of polite society and have experiences censorship and oppression. Both groups would benefit greatly from a secure anonymous way to share data privately.
There's quite a few p2p trolling legal cases started by porn companies.