Ozzy Osborne sings a song that has a line in it, "I tell you to enjoy life, I wish I could but it's too late". Unfortunately for the parents of the child who killed himself after listening to the song--it was not the song that told him to 'end your life'....suicide was already a plan of action for that child, put in place long before he listened to that or any other song.
Same thing goes with rape. It is a need to overpower, dominate and humiliate the victim. Rape is not usually a sexually driven crime, as much as it is a rage and power driven crime. There are plenty of people who need to point fingers and blame something other than the fact that the people who commit rape are flawed and need immense psychiatric help. Unfortunately, it leaves the victim feeling flawed and vulnerable. Not only because of the sexual abuse committed, but also the loss of power over their own body, mind and life. Unfortunately--society also places the blame with the victim, not the perpetrator.
No--porn does not make a good, decent person commit rape. Neither does wearing sexy or flattering clothing make a victim 'ask for it'.