females yelled during 86 percent of all sexual encounters. When females shouted, males ejaculated 59 percent of the time. However, when females did not holler, males ejaculated less than 2 percent of the time.
counting monkey pelvic thrusts is admittedly 'quite weird, but it's science,' researcher Dana Pfefferle, a behavioral scientist and primatologist at the German Primate Center, told LiveScience. 'You get used to it.'
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