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Hence why I suggested a paywall for legitimate distributors of adult media, however there are also the issues of torrenting/peer to peer downloading and etc. I think a lot of individuals would be deterred from going down those avenues, though, simply because it can be monitored/caught by one's internet service provider... which can land you in a whole host of copyright infringement issues.

This idea would still have many of the same effects as a ban, though not as extreme. It's a "light ban" where there are approved or "legitimate" sources. A black market of "illegitimate" producers and distributors would quickly form. Just think of the cigarette black market.