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Sex Drive. The Hypothalamus mediates sex drive in animals. The areas are different for males versus females. Males: medial preoptic area Females: ventomedial area. Hormonal Effects After Puperty. For Males: Testosterone is needed to maintain sex drive. Castration reduces sex drive
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Sex Drive • The Hypothalamus mediates sex drive in animals. The areas are different for males versus females. • Males: medial preoptic area • Females: ventomedial area
Hormonal Effects After Puperty For Males: Testosterone is needed to maintain sex drive. • Castration reduces sex drive • Injection of testosterone restores it
Hormonal Effects After Puberty For female nonhuman animals: Estrogen and progesterone maintain sex drive. For human females: Estrogen and progesterone are not needed. Testosterone (produced by the adrenals) maintains sex drive.
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66% of mothers of male homosexuals recall stress during pregnancy33% for bisexuals10% for heterosexuals
The incidence of male homosexuality is more than double that of female homosexuality
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Batak of Northern Sumatratra • children view as sexual at age 6 • 6-16 years of age same sex activity is encouraged • adolescents best friend describes sexual prowess of his mate to convince girl and his parents that he would be a good mate
A Linkage Between DNA Markers on the X Chromosome and Male Sexual Orientation