As for why people seem to be so intrigued by cartoon characters when they go a-lookin for porn, well, I'm not a psychologist or anything, but I think there's an easy answer. Pretty much all porn tastes boil down to fantasy, and who better to play those fantasies out with (on?) than someone who's not real or even based on a real person? There will be no worries about Rick Sanchez yucking your yum if you present him with a sexy situation. Actually, Rick would probably be glad to burp all over whatever you want to do, so there's that to look forward to.