P1na: To be honest, I recall a roleplay game where three of the players (they called themselves the "violent dwarf association") kept looking for churches to desecrate and burn. They were really enthusiastic about it, too.
Then again, it was a LOTR game, so nothing to do with this, right?
It's tempting to conflate cause and correlation. I seriously doubt that D&D or fantasy in general inspired that behaviour. It seems more sensible that people with violent pseudo-pagan tendencies would also be drawn to a violent pseudo-pagan fantasy world. In the same way that judgemental pseudo-moral folks are drawn to judgemental pseudo-moral religions. :)
Ophelium: Well, there was the Book of Erotic Fantasy for D&D 3.0. Despite it's shoddy presentation, it was a decent book for introducing mature themes into a game. I reference it once in a while for a Pathfinder PbP I run. Nothing like Cursed Orgasm to stop your horndog players.
That gives a whole new meaning to a potion of +1. Which seems to be the same one those spam emails are selling. :D