When I started writing smut in 2016, the Romance genre accounted for 23% of the total fiction market. Self-publishing had never been easier, and the standards of the consumer were, to put it kindly, unexacting. See, when it comes to writing erotica, it's not so much how you write but what you write about. Proper grammar and punctuation are a plus, but the real money is in finding the kinks, crafting a compelling hook, and making sure everyone gets an HEA (happily ever after).