High ranking males invariably win contests for

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“In most regards, dominance appears to be a boon. High-ranking males invariably win contests for limited necessities and luxuries. They are groomed more often and have largely unrestricted access to females in estrus, who may or may not choose to mate with them or even suffer their presence. In contrast, a low-ranking male does not mate with a female in the presence of a higher male, who would disrupt such a coupling.” “DNA evidence shows the quick matings can be effective…two high- ranking males managed to sire two offspring apiece. But a male from a different group managed to impregnate two females from group S, and nine other males of mostly middle and low ranks had one offspring apiece. Previous work occasionally had similar findings, but without the details on the circumstances of sneaky mating and on diminishing mating opportunities among high-ranking males” “The game is the low-ranking males hide, and the females try to get to them. But the high-ranking males follow the females and try to keep them from mating with the low-ranking males,” Zorpette (1995). “The importance of being sneaky. Dominance may not be key to mating of rhesus macaques.” Sci Am. 272(6):29-31. What about primates & a dominance hierarchy for mating-- “Sneaky-Mating”?
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Human Consummatory Sexual Behavior Unlike rats, human copulation is highly varied . “the only unnatural sex act is one that can not be performed”- Kinsey, 1951 In both rats and humans, anticipatory and preparatory acts occur in settings and are performed for access to preferred partners with high variablity and these behaviors are highly modified by the environment i.e. learned.
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Divisions of Male Sexual Behavior For rats, appetitive aspects of sexual behavior are highly modifiable. For men, almost all aspects of sexual behavior are highly modifiable Appetitive Excitement Grooming Investigation Motor activation Preparatory instrumental preference Precopulatory Arousal Pursuit Refractory period (PEI/exhaustion) Consummatory Mounts Intromissions Ejaculation Appetitive Sexual Desire Fantasy Excitement Preparatory instrumental preference Precopulatory Solication Arousal Foreplay Refractory period Consummatory Genital Stimulation Masturbation Copulation Orgasm Male Rats Male Human
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Sex in the Autonomic NS Sexual behavior requires coordination of parasympathetic and sympathetic NS. Parasympathetic NS is activated during sexual arousal. Sympathetic NS is activated during orgasm. Sensory pathways carry information regarding genital stimulation to CNS.
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Autonomic Control of Sexual Arousal
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Testosterone & Human Male Sexual Behavior Huge variation in human sex drive Human castrates can maintain sex drive (i.e. function of prior sexual experience). Little correlation with testosterone levels except for hypogonadal men.
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Hypogonadal Men & Testosterone Testosterone treatment dose- dependently increases sexual behavior in men with low testosterone Hypogonadal men appear to be responsive to erotic stimuli but lack motivation for sex (Davidson et al., 1982; Bancroft, 1980).
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Aging & Testosterone & Sex Drive
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