* The [[Hypothalamus_-_Anatomy_%26_Physiology|hypothalamus]] is inherently female.
* The [[Hypothalamus_-_Anatomy_%26_Physiology|hypothalamus]] is inherently female.
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* Testosterone 'defeminizes' the brain during embryogenesis and eliminates the GnRH surge centre in males.
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* [[Endocrine_System_-_Testes_-_Anatomy_%26_Physiology|Testosterone]] 'defeminizes' the brain during embryogenesis and eliminates the GnRH surge centre in males.
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* The female foetus has no testes to produce testosterone, thus developes a [[Hypothalamus_-_Anatomy_%26_Physiology|hypothalamic]] GnRH surge centre.
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* The female foetus has no testes to produce [[Endocrine_System_-_Testes_-_Anatomy_%26_Physiology|testosterone]], thus developes a [[Hypothalamus_-_Anatomy_%26_Physiology|hypothalamic]] GnRH surge centre.