Sex Drive u The Hypothalamus mediates sex drive

Sex Drive u The Hypothalamus mediates sex drive in animals. The areas are different for males versus females. u Males: medial preoptic area u Females: ventomedial area

Hormonal Effects After Puperty For Males: Testosterone is needed to maintain sex drive. 1) 2) 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.

Some studies indicate a 3% to 7% chance of a male being gay If a brother is gay then the chance can be as high as 25% Different studies have different estimates of the

66% of mothers of male homosexuals recall stress during pregnancy 33% for bisexuals 10% for heterosexuals

The incidence of male homosexuality is more than double that of female homosexuality

Marind Anim of New Guinea u at age 6 the father chooses an adult male u from 12 to 16 adolescent has several male lovers u opposite sex marriages are arranged

Batak of Northern Sumatratra u children view as sexual at age 6 u 6 -16 years of age same sex activity is encouraged u 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