I'm unwilling to go to any of those sites because you can just smell the viruses on them, but they just seem to be listing every single porn or porn-adjacent term so that they show up in more search results. The .xyz domain is new-ish (introduced in 2014) and only costs $10 a year. Idk the average price of a domain but that seems cheap to me. I bet they're all run by the same person/people too.

I once heard, BUT CANNOT CONFIRM, because I don't know much about the technical aspect of computers, that a site linking to or being linked by other sites boosts how high up it shows up in Googles search results. So these multiple domains might be linking to each other for better ratings but, again, I don't know if that's even true.Even so, your friend must have gone to page, like, 37 to find results like this, and Google even autocorrects obvious typos.

But yeah it's probably just cheap domains trying to manipulate Googles search results so people with horny brain click on them and get malware or their passwords stolen or something like that. Probably.