Find all first-order partial derivatives. 
Definitions:
Sex Drive
The natural human desire for sexual activity; also known as libido.
Estrogen Levels
The concentration of estrogen hormones in the body, which play a crucial role in the regulation of the reproductive system and secondary sexual characteristics in females.
Testosterone Levels
The concentration of testosterone, a critical male sex hormone, in the blood which affects a variety of bodily functions and characteristics.
Gynecomastia
Swelling or enlargement of the male breast.
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