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Bios 205 - Exam 2
Sexual Behavior
35
Biology
Undergraduate 2
04/22/2009

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Term
Sexual Behavior
Definition
Gender Traits, Libido, Sexual Orientation, Gender Identity, Attraction/Mate Selection, Mate Bonding, Monogamy vs Polygamy, Receptivity
Term
Behavioral Traits are the result of:
Definition
Interactions amoung a suite of factors that include BIOLOGY, EXPERIENCE, and CONTEXT
Term
NATURE Hypothesis:
Definition
the exposure of the NON-SEXUAL brain to steroid hormones at a CRITICAL PERIOD during gestation & perhaps following birth, ORGANIZES into MASCULINE or FEMININE variants; specific regoins of the brain responsible for SEXUAL BEHAVIOR
Term
NURTURE hypothesis:
Definition
Humans are TAUGHT, IMPLICITLY and EXPLICITLY, to behave in a manner APPROPRIATE to their biological sex
Term
What interacts to determine and modify gender traits?
Definition
BOTH steroid hormones and socialization
Term
Biology and Culture interplay to give rise to:
Definition
Gender Traits
Term
Libido:
Definition
conscious or unconscious SEXUAL DESIRE
Term
Male Sexual Drive (2):
Definition
1)ANDROGENS within a defined range are necessary but not sufficient. 2)Certain brain traits that are androgen-independent are required
Term
Female Sexual Drive (2):
Definition
1)No OVARIAN hormones are correlated to sexual drive but tonic levels of androgens may be needed. 2)'Psycho-social factors may dominate any hormonal influence, particularly in YOUNGER females.
Term
Heterosexuality or Gender Typical Partner Choice:
Definition
Choosing to sexually interact with partners of the OPPOSITE sex
Term
Homosexuality or Gender Atypical Partner Choice:
Definition
Choosing to sexually interact with partners of the SAME sex
Term
Twin Studies:
Definition
If one twin is Homosexual, what is the probability that the other will be? MZ Males=50% MZ Females=48% DZ Males=24% DZ Females=16% Adoptive Sib Males=19% Adoptive Sib Females=6%
Term
Hormone Comparisons (Biological Basis)
Definition
NO differences have been found in hormone levels between heterosexual and homosexuals
Term
Brain Anatomy (Biological Basis)
Definition
Studies claiming to find brain differences in women and homosexual men when compared to heterosexual men have been debunked. A causal correlation between brain anatomy/function and homosexuality has NOT been unequivocally demonstrated
Term
Genetic Differences (Biological Basis)
Definition
One study found DNA 'markers' on the X-Chromosomes of 33 pairs of homosexual brothers. No one has been able to repeat these results leaving no solid evidence of a genetic basis - yet.
Term
Gender Identity:
Definition
The sense of being male or female
Term
Attraction between males and females is culturally influenced and dependent upon: (4)
Definition
1)Visual Cues 2)Auditory Cues 3)Olfactory Cues 4)Other Chemical Cues
Term
Pheromones:
Definition
Chemical compounds released by one individual that elicit a physiological response in another individual; Human Sensory Systems, Sources of Human Pheromones, Roles of Pheromones.
Term
Main Olfactory System (MOS)
Definition
-Olfactory receptors in the nasal cavity detect odorous compounds. -Signals are sent to higher brain centers so perception is conscious
Term
Accessory Olfactory System (AOS)
Definition
-Receptors in the floor of the nasal regoin detect compounds that may habe no odor (vomeronasal organ or VNO). -Signals are sent directly to hypothalamus, bypassing higher brain centers, so no cognitive perception
Term
Probable source of Human Pheromones:
Definition
Apocrine Glands
Term
Apocrine Glands (3)
Definition
1)Mature at puberty. 2)Secrete odorless substance. 3)Bipedal human stance may accentuate the distribution of substances
Term
Possible Effects of Pheromones (3)
Definition
1)Sexual attraction between males and females. 2)Control of female monthly cycles (Presence of males and social groups of females "dormitory effect"). 3)Infant-mother bond in early postnatal period
Term
Major Histocompatibility Complex (MHC)
Definition
MHC is a multigene family that codes for key receptor molecules that recognize and bind foreign proteins for presentation to specialized immune cells which initiate an immune response
Term
MHC
Definition
Humans have been shown (when not distracted by artificial odors) to choose partners with high degress of variability from their own MHC, thus insuring immune systems in offspring with wider capabilities of recognizing foreign substances
Term
Stages of Mate Bonding:
Definition
1)Lust. 2)Romantic Love. 3)Attachment.
Term
Lust
Definition
novelty of early attraction and sexual interaction stimulates DOPAMINE release, which acts as a natural opiate, increasing feelings of intense energy, exhilaration, focused attention and motivation. Low serotonin promotes "obsessive' love
Term
Romantic Love
Definition
Increased tolerance of DOPAMINE reduces the initial 'drugged' feeling, but feelings of long term bonding and closeness are supported by OXYTOCIN (maintained by Making Love, Orgasms with your partner, Hugging your partner, Massaging each other
Term
Attachment
Definition
Long term maintenance by high levels of OXYTOCIN
Term
Polygyny
Definition
Males have more than one female mate
Term
Polyandry
Definition
Females have more than one male mate
Term
Our closest relatives are the:
Definition
Chimpanzees and the Bonobos (Pygmy chimps); We share from 98 to 99% of our genes with them
Term
Bonobos:
Definition
Have sexual activities with ALL members of the community; Disputes over food, mates, territory, etc. are settled by sexual activity! The FEMALES are dominant in communities
Term
Problems with Publications about BONOBOS:
Definition
-Nearly all data were collected in captive populations. - is the activity observed between adults and young, same-sex individuals, etc. really sexual activity??
Term
Receptivity in the Females; Continuous vs Estrus
Definition
-We are the only primate whose females have hidden estrus (cycles). -Human women do not show when they are fertile, and in fact, often do not know themselves when they are fertile. -Human females are (usually) receptive to sex at any time.
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