Researchers Reveal an Evolutionary Basis for the Female Orgasm
Evolutionary biologists believe that spontaneous ovulation first occurred, in the common ancestor of primates and rodents, around 75 million years ago. From here, Wagner and colleagues deduced that the female orgasm must have been an important part of reproduction in early humans. Before spontaneous ovulation, the human clitoris may have been placed inside the vagina. Stimulation of the clitoris during intercourse would trigger the release of prolactin and oxytocin, which would in turn, induce ovulation. This process became obsolete once spontaneous ovulation made it onto the scene.
“It is important to stress that it didn’t look like the human female orgasm looks like now,” said Mihaela Pavličev, Wagner’s co-author of this study. “Homologous traits in different species are often difficult to identify, as they can change substantially in the course of evolution.” She added, “We think the hormonal surge characterizes a trait that we know as female orgasm in humans. This insight enabled us to trace the evolution of the trait across species.”
While the hypothesis is compelling, it has drawbacks. The biggest is that it’s difficult, if not impossible, at least currently, to investigate what, if any, sexual pleasure other female animals derive during copulation. Other experts say, more data is needed from other organisms to shore up this theory. Still, it seems the most persuasive argument to date.
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