Pornography and Masturbation

Ben: Tiny minority? Nope! MOST people masturbate. 80 years ago a research team carefully interviewed over 10,000 Americans. Around 90% of men were masturbating fairly regularly - including married men with active sex lives. And this was before Internet porn!
(http://www.boxturtlebulletin.com/Articles/000,024.htm)

Adam: OK. But that's just masturbation - that's a fairly normal habit? Healthy, totally private, doesn't do any damage. That doesn't mean they're in trouble, watching pornography, surely?

Correct?