Study Reveals Why Monkeys Shout During Sex

I think this applies to many humans as well.

clipped from www.livescience.com Female monkeys may shout during sex to help their male partners climax, research now reveals. Without these yells, male Barbary macaques (Macaca sylvanus) almost never ejaculated, scientists found. Female monkeys often utter loud, distinctive calls before, during or after sex. Their exact function, if any, has remained heavily debated. Counting pelvic thrusts To investigate the purpose behind these calls, scientists at the German Primate Center in Göttingen focused on Barbary macaques for two years in a nature reserve in Gibraltar. The researchers found that 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.