Honestly, if I had to guess, I would think that it would go the opposite way: That someone with an attraction that is illegal and/or harmful to act on discovers the existence of virtual stuff and thinks, "Here we go, I can act on my feelings in a way that doesn't harm anyone." And honestly, if you don't actually find out the details, both situations look the same from the outside: Someone with virtual porn is found to be attracted to the real-life thing. It's just that cause and effect are totally reversed, and in the situation that I imagine, the virtual stuff is blameless, because the attraction would be there either way. Sadly, this is the case with a lot of things that people "know" to be harmful; they say "Oh, we see all these who did A and now B has happened, so obviously A causes B." When it could just as easily be that B causes A, or something else causes both A and B together, or A and B just both happen coincidentally. Things are rarely as simple or obvious as they seem.