Title: Sex Drive
1Sex Drive
- The Hypothalamus mediates sex drive in animals.
The areas are different for males versus females. - Males medial preoptic area
- Females ventomedial area
2Hormonal Effects After Puperty
- For Males Testosterone is needed to maintain sex
drive. - Castration reduces sex drive
- Injection of testosterone restores it
3Hormonal 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.
4Some 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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866 of mothers of male homosexuals recall stress
during pregnancy33 for bisexuals10 for
heterosexuals
9The incidence of male homosexuality is more than
double that of female homosexuality
10Marind 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
11Batak 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
12A Linkage Between DNA Markers on the X Chromosome
and Male Sexual Orientation
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