We wouldn’t allow any of our adverts to be run on porn sites purely from a brand perspective – it’s not something we’d want to be associated with. I don’t think that porn or gambling are the dark, seedy corner of the internet any more so there’s no real reason to link the two industries together.
I’d think the reason that you see gambling ads on there is because it’s dirt cheap because not many brands are willing to be associated with that content – so those that are can afford to sustain poor conversion rates.