Sex Drive - PowerPoint PPT Presentation

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Sex Drive

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Sex Drive. The Hypothalamus mediates sex drive in animals. ... For Males: Testosterone is needed to maintain sex drive. Castration reduces sex drive ... – PowerPoint PPT presentation

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Title: Sex Drive


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 25Different studies have
different estimates of the frequency of
homosexuality
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66 of mothers of male homosexuals recall stress
during pregnancy33 for bisexuals10 for
heterosexuals
9
The incidence of male homosexuality is more than
double that of female homosexuality
10
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

11
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

12
A Linkage Between DNA Markers on the X Chromosome
and Male Sexual Orientation
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