How do the male and female reproductive systems differ?
The 2 reproductive systems differ not only in appearance but to how it influences the brain in hormone regulation.
The male's testicles is the primary sex organ of the male and its two primary hormones are Androgen and testosterone. The Androgen is in charge of making the male look manly and promote body hair and muscle growth which is why many males are hairier than women while testosterone regulates sperm development and sexual behavior. For the females, the ovaries is their primary sex organ. Its two primary hormones are Estrogen and Progesterone. Estrogen is in charge of making the woman look female like breast development, making the skin smoother and hip development to accommodate child rearing. Progesterone is the one in charge of regulating the menstrual cycle for women and fetal development during pregnancy and most likely the reason for PMS (pre-menstrual syndrome) in some women.