OK I'm probably wrong - but I think I heard somewhere that in Japanese culture woman should slightly resist even if it's consensual - to not be considered easy or something like that.
does that still apply when they both women?
It's something that happens even in non-Japanese cultures. Like in my country it's absolutely common to hear about women being "passive" about relationships. When it's between a boy and a girl, It's pretty much considered a stigma for women to make the first move and that we have to pretend to not have interest for a bit (though that outlook has begun to change in recent times).
For cases between women... well... based on experience, it's almost the same. Especially when neither of you know who should make the first move
(Not that I have much experience to speak of anyway)
"Torpe" is a thing