Broomhead wrote:she's a bit... shall I say resistant to sex when she first has it
Although she
initiates it... but, yeah, she's not comfortable in that situation. She's baring herself to someone that she's not even sure loves her, that she barely knows, when it's so incredibly painful for her to let others even see her
face. Basically, she's fighting her way through a DEFCON 1 panic attack, because she feels that she
needs to do this to prove to Hisao AND herself that she can be his girlfriend. (She's mistaken I think, but then, her first time with Hisao was always going to be a DEFCON 1 panic attack, and this gets it out of the way.) And, because the channels of communication aren't set up yet, she doesn't even begin to feel comfortable with communicating what her sexual preferences are to Hisao. (Even then, I think she did actually finish despite all of that...)
Now, why is there so much art of her masturbating? I'm getting a vibe that she's fine with being an inherently sexual person (I can't cite a specific line, but even if she has some really bad attitudes about sex, I get the impression that she
did find Hisao sexually attractive and want to have sex with him, too - not as gung ho about it as, say, Trivun's interpretation of her route from her POV made her, but still), it's just that her anxiety causes problems with having sex
with other people.
And, quite a few KS readers identify closely with Hanako, so...