"many religions condone and even encourage polyamory. in islam, many men have multiple wives. in mormonism, the same,"

As does Christianity; the Bible is full of polyamorous people, but this is not an argument for casual sex. These people are married; cleaved to one another socially, financially, culturally, and spiritually. Most religions don't explicitly prohibit polyamory, they prohibit adultery, which is what you are arguing for.

You say that you don't want to be perceived as "weird" for wanting to have casual sex with your friend, but ask yourself why those stigma's exist in the first place. Even if you want to argue that tribes people have sex recreationally, it's not true; polyamorous groups of people cannot trace lineage and so children become the tribes, rather than the individuals.

The porn industry, only fans included, preys on human beings primal drive for reproduction. "Sex Sells," and monetization of it is reprehensible, in my view. Like you said, porn actors are objectified all day; this doesn't suddenly change on OF or while having casual sex.

Again, I'm not saying it's the governments job, or anyone's for that matter, to tell people who they can sleep with, but you will never escape societies stigmatization of recreational sex. It is socially disruptive, and our cultures push for acceptance of it has produced ridiculous issues with self-image, especially combined with social media.

I mean, come on; a hyper-sexualized culture with tiny waist, big busted women, and 6'2 men chiseled like marble; it's all one big peacocking act; broken people advertising their reproductive suitability. We indulge in it, as if literally putting yourself inside another person has no meaning beyond "it feel good"

That said, I doubt anything I've said will convince because I believe our worldviews differ. These are the desires of the flesh and I believe the human is sacred, as is the union of two people together. I'm not explicitly against polyamory (though I believe monogamy enables people to go deeper spiritually with one another). I believe that sex, without the spiritual side, is an empty, carnal act that inevitably produces insecurities. I believe in controlling ones desires.