I think pornography only has an element of danger in the same way that any other potential addictions do. Anything taken to extremes, whether it be the well broadcast issues such as alcohol, gambling and sex, to the less well known ones such as texting, or dieting can be a problem if it begins to rule your life.
Pornography can be entertaining and fun, both as an individual or as a couple, but when young teenagers are concerned, parents need to be responsible for monitoring what their children are doing.