Literature of such extremes as Stephen King books... This is such an arbitrary line to draw, because detailed sex can happen in both mainstream novels and in erotica, and people can be surprised by just how detailed the novels are. And the mainstream may breach quite a lot of rules that erotica publishers might keep (such as age restrictions).

Yet, I doubt Stripe has a problem selling 'It' [0], despite it having a sex train run on an underage girl with excessive description.

[0] It, 1986, novel.

I don't know them, of course, but take a moment to reflect that every single exec at Stripe probably agrees with you. There is always a mahout [1]

[1] “Because the elephant has a master, a mahout. And his master is an unforgiving son of a bitch with a nasty barbed-iron stick and an elephant gun. He is otherwise known as an institutional investor. All start-up entrepreneurs should say their prayers for institutional investors, those fabulous beasts, every night. “Dear Lord, thank you, thank you for institutional investors in big companies.”