Those who insist any porngraphy must be prohibited seem to make a fatal mistake:sexual fantasy is sexual desire and sexual act.The truth is this:sexual fantasy is NOT sexual desire nor sexual act
For example,famous American sex educator Dorian Solot and Marshal Miller writes in their book "I LOVE FEMALE ORGASM” thus:

No one knows why specific thoughts or stories arouse specific people.Some fantasies that turn you on may be things you'd like to act out someday,especially if the situation were right and you had a partner you particularly trusted.Other fantasies that get you going may involve situations your analytic mind finds downright problematic or offensive,that you never,ever want to have happen in the real world.For example,numerous studies find it's quite common for women to fantasize about being overpowered and forced to have sex;some research even finds it's among the most common sexual fantasies for women.
Obviously,it can be disturbing to be aroused by a rape scenario,since no one wants to have sex against her will in real life.Many researchers and women themselves point out that a sexual fantasy is definitely not the same thing as a sexual desire.Just because a woman finds it sexy to imagine a given scene does not mean she ever wants this scene to come true.

We can say the same thing when we talk about men's sexual fantasies:

No one knows why specific thoughts or stories arouse specific men.Some fantasies are hamless,others are involve situations whici are seually criminal if a man tries to have happen in the real world.
Obviously,it can be probematic for men to be aroused by a rape scenario.However no men want to have sex as like their sexual fantasies.They fantsize,but don't want to have their sexiual fantasies to happen in the real wordl.A sexual fantasy is a sexual fantasy.It is definitely not the same thing as a sexual desire and sexual act.Just because a man finds it sexy to imagine a given scene does not mean he ever wants this scene to come true.

Sexual fantasy is NOT sexual desire.It's not sexual act.If both were the same,many women would want to be overpowered and forced to have sex or would desire rape.It's impossible to conclude　in case of women both are not the same but in case of men both are the same.
However anti-porn people wrongly equal sexual fantasy to sexual desire and act.And that leads a wrong idea and conclusion "Porngraphy induce sexual crimes."
Porngraphy is not a guide to sexual act,but a product of sexual fantasies.It is the device that helps men's masturbation,not sexual crime.The use of porngraphy is the same as that of masturbation.
The Bible doesn't prohibit masturbation.Neverthless why UK and US people prohibit Japanese porngraphy?