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Sex Drive PowerPoint Presentation

Sex Drive

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Sex Drive

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Presentation Transcript

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

  2. Hormonal Effects After Puperty For Males: Testosterone is needed to maintain sex drive. • Castration reduces sex drive • Injection of testosterone restores it

  3. 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.

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

  5. 66% of mothers of male homosexuals recall stress during pregnancy33% for bisexuals10% for heterosexuals

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

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

  8. 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

  9. A Linkage Between DNA Markers on the X Chromosome and Male Sexual Orientation