At the risk of sounding like a far-out social conservative crossed with a radical feminist, do you have any evidence to support your assertion that viewing porn satisfies a 'harmless urge'?
It is widely claimed that the subjects of pornography are typically vulnerable girls, and that the profits pass largely into the hands of powerful middle-men. It is also widely claimed that porn stars often struggle to maintain a happy family life off-screen, and that their economic prospects are bleak once their breasts begin to sag or they suffer scarring from a caesarian section. Some people claim that porn stars are discouraged from using condoms and are particularly likely to suffer unwanted pregnancies or life-threatening sexually transmitted disease.
I don't know if these claims are true, although they certainly sound plausible. If they are true, viewing pornography is no more a harmless urge than the 'harmless' urge once felt by cotton farmers to maximise their profits through the purchase of slaves.
Unfortunately, simply asserting that something is 'harmless' doesn't actually make it so. It is entirely plausible that your appetite for the consumption of porn leads to human misery and disease at the other end of an https connectiion.