Rukia's experience?
I saw some people arguing on tumblr over how sexually experienced Rukia is, and I felt the need to write this because this is one of my biggest pet peeves. I have been put off by more than one fic where Rukia is painted as someone "more experienced" than Ichigo in that regard. Usually there's no explanation or backstory given, like that she had been romantically involved with Renji or Kaien or even someone else, and that's what I find the most irritating about this. It's not the fact that the writer is changing the nature of Rukia's relationship with either of them, it's the fact that they are just ASSUMING Rukia is "experienced" because she is "older," and that is bullshit.
First of all, let's get something straight: Rukia has never been canonically shown to be in a relationship with ANYONE. Not Renji, not Kaien, and not some random nameless guy. We know that she was not involved with the two former from the flashbacks we've seen, and then we learn that after her adoption, she felt isolated and alone, as well as during her time at the academy, when Renji was making new friends, but she was NOT.
Rukia's not even that old. Shinigami age slower, obviously, so she and Renji are probably in their late teens/early twenties at the beginning of the series in human years, but that is irrelevant. Someone's age is not necessarily an indication of their romantic experience. We have SEEN how lonely Rukia was her entire life, we've SEEN that Kaien was the only person from her past life that she had feelings for, and it was clear that nothing ever happened between them. In Bleach canon, Rukia is as romantically experienced as Ichigo, meaning she is not romantically experienced at all. Anything other than that is your (out-of-character) headcanon.
Lastly, I just want to say that the only people Rukia could be imagined to have been romantically involved with (as in a non-canon way) are Renji and Kaien. It would be completely out-of-character for Rukia to just hook up with some random guy. Stop projecting.