Well, the theory that there is less focus or a shortage on the younger YA category is pretty accurate. I can speak for myself, when I started writing YA about 11 years ago. I had a few books with age ranges between 15 and 17. I thought it was perfectly natural for these kids to experiment with sex, I mean, not the heavy blunt-force trauma coupling, but the hesitant, clumsy naked attempts where hands are used more than anything else. But I got the chew-out from agents and publishers about under-aged sex, including my current agent. A few of them didn't mind. The majority of them did, (in my case). So if I wanted a little action between my characters, I damn well had to get all of them 18 or over. No way could I even have a 18 girl with a 17 years old guy. If I wanted to keep those younger age ranges, it was suggested to me that some kissing and light, quick petting, and maybe some accidental nudity might okay. No coupling. Not even simulated.
I guess that stuck in my head all this time because even if I had teens of age, I didn't go with the full-on sex acts. I just let them explore a little more. In essence, I've kept my kids in the upper teens just so they could kiss, pet and ogle a little bit. Oh, not even any behind the door stuff either, 'cause it implies.
NA was not the answer for me either, because I'd heard many times that it was the NEW kid on the block, but I never saw a huge trend shift toward it. Agent and publishers gave us the big NA talk, but not the big bought. Personally, I never saw it take off. Hearsay and rumors does not a tsunami make. Not to say that some writers didn't break into it and launch their careers.
In reading that article, I'm just wondering if we try to plug that gap, will we be rewarded for it? Will there truly be some openings? Ya, know, sometimes I think pubbers and agents unintentionally blow smoke and use sleight of hand. They pass the hot news around. Then it dies down. Then you get reminded again.
I guess I'm stuck with the higher age range YA characters, who are a bunch of virgins. Oh, the shame of it. It's so embarrassing!