Yeah. Everything’s gotta have a genre these days, right? In case you’re unsure what we’re talking about here, this is what WikiP says:
New Adult (NA) fiction is a developing genre of fiction with protagonists in the 18-25 age bracket. The term was first coined by St. Martin’s Press in 2009 when they held a special call for “…fiction similar to YA that can be published and marketed as adult—a sort of an ‘older YA’ or ‘new adult’.” New Adult fiction tends to focus on issues such as leaving home, developing sexuality, and negotiating education and career choices. The genre has gained popularity rapidly over the last few years, particularly through books by self-published bestselling authors like Jamie McGuire, Colleen Hoover, and Cora Carmack.
Basically, it seems to be what happened after people got bored of supernatural/dystopian fictional gubbins getting in the way of their first-romance tales. And hey while we’re at it, what if these protagonists, like, fully got it on? Boom! New Adult!