It's hot, it's muggy as all hell, and I just want to read something smutty and fun.
My parents absolutely policed what I read, but weirdly their barometer of what was appropriate had more to do with quality than it did with content.
According to Wikipedia, the books I like are specifically "Regency Historical Romances," which prioritize explicit sex scenes over historical accuracy. Hell, yeah.
From what I can see, the iteration of new adult that St. Martin’s Press appears to be pushing in its attempt to turn new adult into a thing is not going to sell well, because it’s not what people really want.