Once we start to assume that women have fundamentally different bodies from men, this quickly raises the question of how far the gaps stretch. Do sex chromosomes affect not just our health, but all aspects of our bodies and minds, for example? If every cell is affected by sex, does that include brain cells? Do oestrogen and progesterone not just prepare a women for pregnancy and boost her immunity, but also creep into her skull, affecting how she thinks and behaves? And does this mean that gender stereotypes, such as baby girls preferring dolls and the colour pink, are in fact rooted in
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