since you're just watching it doesn't have any negative effect and it might help you with being able to control yourself in public and such so i don't necessarily see it as a bad thing
LOL. I am impress you watch porn without masturbation. I dun get enough enjoyment just from watching and get very frustrated thus why i masturbate. I dun think it bad for health and it a normal thing to do.
Plus it something all people learn to do naturally thus I doubt it bad for the body unless you go insane and buy toys and crap. LOL