You're misinterpreting the meaning behind what I wrote. Be it shounen Ai or Yaoi, they both have one thing in common and that's BL tag. The only difference is that shounen Ai is more about the romance while Yaoi has both romance and sex. I read both as long as the story is interesting but as a reader, there are times when you get really excited and want that clear definition between the characters. Their motives and distinction, what makes them unique to the plot and where or from what angle are they coming from. I don't know if you understand what I'm saying but please don't twist my words and make me sound like some pervert or sex fanatic.
I forgot to mention this, in the comment section there has been a lot of hype about YeChan being the bottom and that got me really curious too cause it's very rare to find such masculine bottom(be it shounen ai or Yaoi, not much difference). Anyways, I don't know about others but my curiosity has nothing to do with sex, this is just a mere intrigue as a reader about who the main characters are and their interest as a fictional person.
Again, our curiosity is not about sex but since it's a BL, of course it's natural to wonder. It's not like the relationship between a man and a woman that you can see the clear distinction about who is what. It's hard to tell, most especially in shounen Ai. It's not that we don't enjoy the story, we do, it's just human nature to be curious.
I'm already getting tired of waiting to find out who's the bottom and who's the top, so far we've been living off of our assumptions and mixed signals from their interactions