(Please note this post is not a rhetorical question, although I doubt if anyone has the definitive answer I'm hoping some sensible thoughts on the subject will be posted.)
In the past I have often said that real money can still be made from porn sites if you advertise non-adult goods on your site. The reply is usually that no sponsor allows this. That is not true, there are some, but they are few and far between, and it takes a bloody lot of work to find them. However, I just remembered from my teenage years that back when the W.W.W. did not exist and we got our porn from printed magazines stacked on the top shelves of newsagents, that those magazines contained lots of adverts for non-adult products. Many of those adverts were for companies that were (and still are) household names. Most of those companies still exist, and nowadays advertise on the Internet. Yet none of them would consider taking out an advert on a porn site.
So when and why did the change happen? What caused them to stop advertising in places where naked ladies show their bits, and shun us?
I doubt there is any real use for this information, but I'd like to know!