as a christian man or woman , porn is one of the worst acts of modern socioty

Why porn in Christianity is forbidden?

It is the acceptance of immoral behaviour cursed by god by watching 1 to 6 people doing any sexual acts.

God himself mentions how adultery and lustfulness leads to becoming the full time worker of the devil

Zekiel 23:20-21 (NIV)

There she lusted after her lovers, whose genitals were like those of donkeys and whose emission was like that of horses. So you longed for the lewdness of your youth, when in Egypt your bosom was caressed and your young breasts fondled.

Ezekiel 23:8 -New International Reader's Version (NIRV)

"She started being a prostitute in Egypt. And she never stopped. When she was young, men had sex with her. They kissed her virgin breasts. They used up all of their sinful longings on her

In the time of Jesus it was also made clear about lust and men and women being visual  

Matthew 5:27
27 “You have heard that it was said, ‘You shall not commit adultery.’
28 But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.

A Christian man or woman should have the power to turn away from something as little as paper magazines or someone else or even themselves putting on a DVD or video

Psalm 101:3 I will set no wicked thing before mine eyes: I hate the work of them that turn aside; it shall not cleave to me.

And so if he or she does watch it as the bible recalls its adultery in the eyes of god and if those images of pornography leads him to temptations again it says

1 Corinthians 6:18

Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.

The women and men in pornography not only will be condemned to hell but they will also be cursed as 80% of any videos or images in porn is filled with women doing acts of vanity getting plastic boobs and spraying themselves orange

Philippians 2:3–4 (NIV)

3 Do nothing out of selfish ambition or vain conceit, but in humility consider others better than yourselves. For each of you should look not only to your own interests, but also to the interests of others

It is selfish for you to commit adultery as when you have sex with your partner you become one and god sees those who are together by god as one body

Therefore a man leaves his father and his mother and clings to his wife and they become one flesh" (Gen 2:24)

So what did God create for us humans to not commit adultery and have no reason to?

"Marriage should be honored by all, and the marriage bed kept pure, for God will judge the adulterer and the sexually immoral" (Hebrews 13:4, NIV).

What about temptation is it my fault I’m tempted and wanting to be “adventurous”?

"When tempted, no one should say "God is tempting me." For God cannot be tempted by evil, nor does he tempt anyone; but each one is tempted when by his own evil desire, he is dragged away and enticed" (James 1:13-14).

So now your thinking great well now I’ve downloaded, brought or opened up the web page I might as well go ahead with it but…

"No temptation has seized you except what is common to man. And God is faithful; he will not let you be tempted beyond what you can bear. But when you are tempted, he will also provide a way out so that you can stand up under it" (1 Corinthians 10:13).

How serious is it that I do masturbate to the act of adulteries?

"If your right hand causes you to sin, cut it off and throw it away. It is better for you to lose one part of your body, than for your whole body to go into Hell" (Matthew 5:30).