"Hot food not sex"

The success of the human species is all due to our mastery of fire and cooking, a scientist claims. 

Hot food not sex was the basis of our relationships.

We are the “cooking ape”, according to Richard Wrangham, a noted British anthropologist and primatologist at Harvard University. The unrivalled success of the human species is down to our mastery of flame and our use of it to transform raw food into cooked. Ours is a species built on hot dinners, not cold plants and berries. ..

“I believe the transformative moment that gave rise to the genus Homo, one of the great transitions in the history of life, stemmed from the control of fire and the advent of cooked meals,” Wrangham explains in his new book Catching Fire: How Cooking Made Us Human. “Cooking increased the (calorific) value of our food. It changed our bodies, our brains, our use of time and our social lives.” He argues, as no one else has done before, that cooking was pivotal in our evolution.
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Cultural, historical and culinary clues point to the plausibility of Wrangham’s intuition. There is no society on Earth that does not cook; not a single people exists on raw food alone.

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“I couldn’t believe that nobody had thought about the energetic significance of cooked food [cooking releases locked-in calories by breaking down molecular structures in plants and meat; without cooking, some material passes straight through].
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Cooking would have made a radical difference to the creatures who mastered it: it made plants and meat more calorie-dense; it spared our ancestors from the marathons of mastication required with raw foods (wild chimps spend up to five hours a day gathering food and chewing it); it was easier on the gut. It is utterly within the bounds of belief that the first hominid to put a flame to his food started an extraordinary chain of evolutionary events that culminated in us, the ape in the kitchen.
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Human beings are unique in that when we cook, we do it to feed others as well as ourselves (other apes, even those who pair-bond, forage for themselves and don’t share). And in almost all societies it’s women who tend the stove. Having a husband ensures that a woman’s gathered food will not be stolen, while having a wife means a man will have an evening meal.

To some, though, this train of thought — that the way to a man’s heart really is through his evolutionarily shrunken stomach — is even more heretical than the idea that we are the cooking ape. “People don’t like it because over the past decades we have understood that our social system comes through the competition for reproductive partners. I’m saying, pair bonds are firstly about food, and that gave a platform to develop those relationships further.”