Is that a serious question?
why should we be more concerned about a picture of a naked woman before which a man masturbates than a picture of Shiva before which a man worships?
Actually, I would probably be concerned about both. (Although either man would also probably tell me to "TerAYsa it.") They are apples and oranges, tho' and therefore difficult to compare. If you want to, you could just answer this question instead: What is morally redeeming about an obscene picture of a naked woman? Don't you see that as being exploitive? Degrading to women in general, degrading to SEX itself, and degrading to you for ogling it (as an aside to Tacticlogic, I don't consider this an emotional argument)?