mixed_biscuits
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Is this assumption grounded in anything? The prevailing norms for girly behavior are VERY strong.
Yes, but not THAT strong. In other words, there is a good chance that a girl not minded to do girly things will not do them and, if minded to do boysy things, will express an interest.
Girls and boys "seem" to have different interests at the present moment from where I sit, therefore, nature. Is basically what you're saying.
I suppose I believe that there are likely to be biological sex differences that are decisive and that culture is more likely to reflect these than not.