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"Nowadays, there is little money around (even in the US), field researchers get no funds, and scientists working in the lab face the opposition of animal rights activists.In addition, this the era of neuroscience and molecular genetics.
In this case, however, the female wiggles her backside at him, presumably signaling that she is not impressed.
Studies of primate orgasm have often focused on macaques, a subset of monkeys which are used often in research because they're genetically similar to humans and have similar reproductive systems.
According to Alfonso Troisi, a clinical psychiatrist in Rome who has studied female orgasm in Japanese macaques, they're easier to study in the lab than gorillas or chimps.
"The short answer is that we don't know much about orgasms in other species -- in fact, scientists are still studying the significance/evolution of female orgasms in humans," Marlene Zuk, a professor of ecology, evolution and behavior at the University of Minnesota, wrote me in an email.
For the most part, we assume that male animals orgasm because there's an ejaculation--though one can happen without the other, they usually go hand-in-hand.