Well, seeing what a fasinating conversation we're all having here, I thought I'd put in my $.02.
Porn is like candy. It's fun easy to use. It draws you in against your will when put in commercials (just like sweet foods are hard to resist). It may be nice as an appetizer, or between meals, but overuse can cause permanent damage, especially when not brushed over (expunged from History). Overuse in and of itself is bad too, degrading standards of what satisfies one's needs.
No wait... porn is healthy and natural. It's like Newsweek. If you want the real stuff, it may take some effort to find the ultimate truth, and for those not mature enough to handle it, that may not be possible. In an average day, Newsweek is acceptable.