If you are like most modern men, you use masturbation and pornography less as a substitute for sex and more as a drug. Sexual stimulation to the point of ejaculation leads to a large dopamine release in the brain, in the same way that heroin leads to a dopamine release in the brain.

If you are addicted to pornography, this can be identified by a brain scan.
https://i.4cdn.org/wsg/1576399342315.webm
People who are addicted to pornography masturbate to it several times a week, if not more.

Even if you were initially to get into pornography as simply a substitute for sex, it would quickly become used as a drug, because of the addictive nature of the material, and the ease with which dopamine can be released.
Masturbation to pornography is also more stimulating than actual sex itself, due to a number of factors, including he novelty of the women, as well as the way you are able to cater the experience to your own desires.

So this needs to be understood: you need to look at it as nothing more or less than a type of drug addiction.
You are ensnared by satan himself.