05-male%20sb - Neuroendocrinology of male copulatory...

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Neuroendocrinology of male copulatory behavior. Rusty makes his move
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What do males and females want from each other, i.e. , what are their reproductive strategies? Is the ideal sex partner the ideal mate? (Only an issue for species which actually have ‘mates.’)
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History of the evidence that something from the testes stimulates male sex drive. 3. Effects of castration on libido (antiquity). 4. Testis transplants (A. A. Berthold ~1849) 5. Treatment with testicular extracts (C. Brown-Sequard ~1889). 2. Seasonal changes in testis size and libido (antiquity). 1. Changes in testes and behavior at puberty (antiquity). 6. Treatment with purified steroids (C. Stone et al. 1930’s).
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The ‘hydraulic theory’ of male sexual motivation, ~1880. 1. Between copulatory episodes, fluid (semen) builds up in the seminal vesicles. 2. This information is conveyed to the brain via sensory nerves innervating the seminal vesicles. 3. This pressure can be very uncomfortable, and if unrelieved, can be excruciating and permanently damage the male reproductive system. Well, this is just a bunch of bullshit! It’s just a line guys use to convince women to have sex with them. Don’t fall for it.
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Motivated behaviors ( e.g ., eating, drinking, copulation, parental behaviors) are typically divided into two phases, appetitive and consummatory. Appetitive phase: finding food. Food intake: Consummatory phase: eating it. Consummatory phase: copulation. Mating behavior: Appetitive phase: finding and courting a mate.
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Male rat mating behavior has three components. Mounting: male approaches female from behind and places his forepaws on her hindquarters Intromission: male mounts female, inserts penis in vagina, thrusts rapidly, dismounts quickly Ejaculation: male intromits, holds intromission for several seconds, distinctive motor patterns
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1. Male and female ‘investigate’ each other. 2. Male mounts female and attempts to intromit. a. If successful, male dismounts quickly (< 2 seconds) and then pauses ~10-30 seconds. b. If unsuccessful, male keeps trying without waiting. 3. After 5-15 intromissions male ejaculates. Sequence of rat copulatory behavior (male’s version) 4. Male ‘plays dead’ and ‘sings’ ultrasonic song for 5- 15 minutes. 5. They start all over again until male has ejaculated 5-10 times. 6. Male loses his interest in sex for a day or two . . . . .
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. . . . . unless a better offer comes along. One day President and Mrs. Coolidge were visiting a government farm. Soon after their arrival they were taken off on separate tours. When Mrs. Coolidge passed the chicken pens she paused to ask the man in charge if the rooster copulates more than once each day. “Dozens of times,” was the reply. “Please tell that to the President,” Mrs. Coolidge requested.
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