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It's not so much that she comes off as "asexual" or "promiscuous", but that she's not afraid to express her sexuality when she wants to. I mean, she's far from a nympho, and certainly not a slut. And while she did dress provocatively during most of the first S.A.C series, it was really just her way of being "casual". Granted, one should remember that the anime toned down the more abundant sexual material the original manga had.