According to Judith Lorber,differences between the sexes are not easy to explain because gender isn't natural but rather is:

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Judith Lorber argues that gender is not natural or biological, but rather is a social institution that is constructed and maintained through social interactions and cultural practices. Therefore, the differences between sexes cannot be solely explained by biology or nature, but rather by the social and cultural norms and expectations associated with gender.

According to Judith Lorber,differences Between the Sexes Are Not Easy