I think this is the case. Think about a porn induced fetish you may have. I'll give my own example which is femdom: Once I reached puberty (possibly before that) I started to like girls. But I was only interested in the more normal stuff. Kissing, hugging ect. I had no interest in porn but all the guys I knew would talk about it. So when I was 13-14 I started watching porn. At first it was all lesbian porn. Then one video involved one woman in control and another in bondage and next thing I knew this lead to me being into femdom and almost exclusively watching it for years. But before I watched lesbian porn I had a lot of fantasies about eating out woman. It may be possible this originally lead me to watch that type of porn in the first place since the woman often do that in lesbian porn. But what lead me to crave that? There is no reason to think that I'm just born to crave that. Why would I be? How does that lead directly to procreation? I find it difficult to believe anything other than craving heterosexual sex is hard wired into the brain. I honestly would say that even homosexuality is controlled by the environment we live in. If you read the book "Your Brain on Porn" by Gary Wilson (which I recommend to everyone on this website) there is some evidence for my claim. They took virgin male rats and placed them in a cage with a female rat. The female was sprayed with a scent that would normally repulse the rats. They had sex with her and began to love the scent. When they sprayed a block of wood with the same scent the rats played with the wood, something they would not have done if it wasn't for the female rat. But some of you might have fetishes since before porn. I would argue that it was sexualized to you before you could remember (probably by accident). Take a common fetish, the foot fetish. I have heard a theory that many men have this because when they are little they crawl around and see so many feet. I think liking large breasts and breast feeding as a young one could also make men have a large breast fetish. Once you get a fetish that young, you'll probably never lose it. The last point I would like to make is about beauty norms. We push standards of beauty that isn't universal all cultures. An example is a skinny girl with large breasts and a big ass. In other cultures, the men like fat girls more often. A lot of men only like the looks of girls from a certain race. Often white and Asian girls are picked over black girls. There is no reason this should be the case other than those beauty norms are pushed on society. Think of the typical movie hot girl. Blonde hair, blue eyes, light skin, large breasts and a decent sized ass. There is no reason this should be more attractive than a fat black girl so long as they both have a pretty, symmetrical face which is universally liked in all cultures. I don't like fat girls myself but I accept that it is just because it was pushed onto me my whole life. I like girls of every race, don't have a preference of one race over another. But I know lots of guys do. Anyways, this is a long post but I think it's important to understand in order to tackle the root of our addiction. Those struggling with fetishes, especially porn induced fetishes, know that it is because your brain is plastic. You can break a lot of those fetishes that are problematic by not watching porn and appreciating the beauty of girls around you. Hope to here your guys perspective on this topic. Thank you for reading.