Those are just the noises that Japanese girls make.
And for the most part they are Maguro (the japanese word for Tuna. Basicly, Dead fuck.) Because Japanese guys would be turned off by a girl that is too 'into' sex.
So even the AV girls will lay back with hands beside the face and squeek.
It is also the reason they are into rorikon, (into younger girls), they want a girl who is inexperenced, because of self doubt of their own.
Of course there are lots of exceptions, and many girls are getting into a sort of sexual revolution here, but for the most part it is true.
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