Jesus warned you against lust and infidelity
"You have heard that it was said, ‘You shall not commit adultery.’ But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart. If your right eye causes you to stumble, gouge it out and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell. And if your right hand causes you to stumble, 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 5:27-30
Jesus warned you about lust and infidelity. Do you think you are being loyal if you watch porn or other women? Would you like it if your partner also indulged in other men, masturbated while watching other men or had lustful thoughts and did the same thing as you?
No? Then don't do it.
Are you single and want to find a partner? You will not be loyal from the start if you don't break the chains of lust and addiction. Do you have a partner or are you married or a father? You are already cheating on her. You just need to realize it, admit it, and stop doing it.
It is your free will.
Remember Jesus and his biblical masculinity - faithfulness, kindness, humility, generosity, forgiveness, love, purity, faith.
I can also recommend the very inspiring series The Chosen, where he is portrayed excellently and his being is a true inspiration for real life practice.
God bless you.