A few years back i used to work for a porn company and they are not.
There is an old protocol still creeping around smartphones known as WAP Payment (yes that WAP) which was/is used to buy stuff on the mobile web and the purchase shows up on your phone bill.
They buy all type of mobile ads (banner, text, popup, modal, etc.) and when you open the ad you get billed 4€, 5€, 6€ per week or month, without any confirmation whatsoever. Some phone carriers ask for user input (mostly the user has to click a button "I agree") but that's where click-jacking, CSRF and other kind of exploit comes in, very few ask for a confirmation code.
The sad thing is that they know, the carriers know but they don't care, until enough people complain about it then they shutdown the service to that website for a few days (in some cases they shut it down permanently) but they always come back online.
Sometimes I find myself thinking that working in porn could actually be pretty interesting - what with massive caching needs, video encoding etc etc... Unfortunately the few job ads I’ve seen were for super-boring stacks like PHP or Perl, which I’d rather avoid.
Definitely, I'm convinced that a lot of people that made youtube and other video hosting sites work in the early days actually came from the online porn industry.
I’d rather not work for either, but if you’re not in a hot tech area, then your choices are limited.