Our bodies, minds and sexual habits all reflect a highly sexual primate. Research from primatology, anthropology, anatomy and psychology points to the same conclusion: A nonpossessive, gregarious sexuality was the human norm until the rise of agriculture and private property just 10,000 years ago, about 5 percent of anatomically modern humans' existence on Earth.
The two primate species closest to us lend strong -- if blush-inducing -- support to this vision. Ovulating female chimps have intercourse dozens of times per day, with most or all of the willing males, and bonobos famously enjoy frequent group sex that leaves everyone relaxed and conflict-free.
The human body tells the same story. Men's testicles are far larger than those of any monogamous or polygynous primate, hanging vulnerably outside the body where cooler temperatures help preserve standby sperm cells for multiple ejaculations. Men sport the longest, thickest primate penis, as well as an embarrassing tendency to reach orgasm when the woman is just getting warmed up. These are all strong indications of so-called sperm competition in our species' past.
Women's pendulous breasts, impossible-to-ignore cries of sexual delight, or "female copulatory vocalization" to the clipboard-carrying crowd, and capacity for multiple orgasms also validate this story of prehistoric promiscuity.
"But we're not apes!" some might insist. But we are, in fact. Homo sapiens is one of four African great apes, along with chimps, bonobos and gorillas.
"OK, but we have the power to choose how to live," comes the reply. This is true. Just as we can choose to be vegans, we can decide to lead sexually monogamous lives. But newlyweds would be wise to remember that just because you've chosen to be vegan, it's utterly natural to yearn for an occasional bacon cheeseburger.
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