Just because it's not heavy on the sex and smut, doesn't mean it's not interesting. Obviously the author isn't rushing anything and is making sure to flesh out the plot which will most likely lead to when they finally do get intimate. Sure its shounen ai at this point, but sex isn't the only interesting thing in a yaoi manga.
Omg i get you!!! I really like some good stories with nice plots. But if i’m not already hooked on something, i’m usually looking for a story with smut, because since most of the yaois have crappy plot, at least the smut can make it good in a way xD. But it’s still *on going* so it is yaoi even if theres only 1 sex scene at the end
Difference is though, how much of a plot is in the story. Shounen ai focuses on that with little physical intimacy whereas Yaoi is said to be little to none with focus on the physical sexual relationship. But stories these days do both, and in Japan its classified as Boys Love. I think that's the more appropriate term to classify it but the West understands the terms completely different.
The tag yaoi was given by the fans after we read that they were considering having sex. At first this manga was tagged as shounen-ai only. And tags are never by the author but translators/readers and sometimes publishers, so I assume you're saying that the author writes/draws a yaoi manga without hot sex scenes and that wasted your time because the plot was not engaging enough for you (so you ended up having to skim for sex scenes). But the author shouldn't have to take the blame because we don't even know if she plans a sex scene at all, yet we all know from the beginning she wants this story to be detailed about the kabuki world and actors. It's not her fault that your expectation was not met because she didn't even tag it as a yaoi or anything.
Sorry if I sound harsh, I just think you're misunderstanding something.

because the story wasn't as I expected, there is a tag of Yaoi but it's a Shounen-Ai from my point of view and for me that was the main reason why I kept reading it but when I finished to read like 120 pages and still there wasn't anything and the background of the story wasn't my type at all I started to slide the pages without even reading it in the hopes of finding some Smut parts because that was my intention from the beginning before starting to read it and in the end there was nothing called Yaoi here, sorry Sensei I know you worked really hard to make it but it wasn't my type at all anyway keep working who knows there will be other of your work that might be more interesting then this