pornography: the explicit representation of the human body or sexual activity with the goal of sexual arousal.
"erotica" refers to portrayals of sexually arousing material that hold or aspire to artistic or historical merit, whereas "pornography" often connotes the prurient depiction of sexual acts, with little or no artistic value.
watching a porn has its own implication... one starts having an urge to do the same... may take certain steps taht they may regret later( if tahts a girl!!) also may lead to crime( in boys generally!!)if the other person resists..
so my theory is its fine taht sex is am imp part of our life but to make a person sexually active artificially( i mean arousing his urge by prompting him/her to watch others doing the same!!) is like giving a triggering of a reaction which may have serious implications.also i fail to understand wats the motive behind it?