I think that in life the best thing is to have things in moderation. For an adult who is comfortable with his or her sexuality and the fact that we are sexual beings who can derive pleasure and stimulation from visuals, then it is perfectly fine. If someone really really likes porn maybe more than the average person (whatever average means) maybe the person should try to incorporate the porn in with real sex, just for a nice and healthy BALANCE. I am no expert, so I'm just speculating.