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Actually, when we talk about tomboys or gay people or women with more masculine personalities or men with more feminine personalities that's psychology. So my discussion was about equally anatomical and psychological.
As for "nature vs nurture" everything is both to some extent. The issue is to what extent. And in what circumstances. If you starve a young boy nearly to death he is likely to lie passively rather than run around actively doing competitive games and other "masculine" behaviors.
People used to make a big fuss about whether gayness in males was nature or nurture. For a few decades geneticists were announcing one or more genes "associated with" homosexuality every year but none ever got confirmed by subsequent studies. However few if any genes are known to have obvious effects on any behaviors. Behaviors are apparently too complicated and multigenic for that.
Frankly, the "nature vs nurture" question is only discussed by non biologists these days. Biologists rarely discuss that any more because we already know the answer. Whatever the trait, it is influenced by a complex mix of both genes in the infant and its environment. And other complexities. Such as inherited environments. Stress from poverty can cause personality changes and poverty tends to be inherited. Such as epigenetic changes in the mothers DNA caused by the mothers environment or even the environments of her mother. For example, A baby can inherit from its mother DNA modification patterns that change the baby's way of metabolizing and storing sugars. And the DNA modification patterns came about in the baby's grandmother, who experienced a famine. The famine didn't change the grandmother's genes but it did change the methylation patterns, and it turns out those patterns are inheritable, at least for three generations. So you can "inherit" in certain ways the environment of your grandmother, including the horrible famine she experienced in WW II. And if you think that's bad, the male and female parents put their own modifications on the genes they pass on to the baby. And the fathers contributions tend to make the baby grow faster so the baby is bigger and stronger. but the mothers aim for a slower rate of growth so she is less damaged in birthing, it is assumed.
