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Posts Tagged ‘sexes’

Navigation and the sexes: Hunters and shoppers

Men and women navigate differently

MEN are generally better than women on tests of spatial ability, such as mentally rotating an object through three dimensions or finding their way around in a new environment. But a new study suggests that under some circumstances a woman’s way of navigating is probably more efficient.

Luis Pacheco-Cobos of the National Autonomous University of Mexico and his colleagues discovered this by following mushroom gatherers from a village in the state of Tlaxcala for two rainy seasons. Two researchers, each fitted with GPS navigation devices and heart-rate monitors, followed different gatherers on different days. They recorded the weight of the mushrooms each gatherer collected and where they visited. The GPS data allowed a map to be made of the routes taken and the heart-rate measurements provided an estimate of the amount of energy expended during their travels. …

Behaviour of the sexes: The hormone of laddishness

Oestrogen, not testosterone, is what makes a male act like a male

IN ALL species that practise sexual reproduction, males and females show gender-specific behaviours. These range from the way they mate to the way they defend—or fail to defend—their territory. Both males and females start out with the same template at birth, but then something acts on the male to masculinise him for life. But nobody knows just how that happens.

It is well known that sex hormones like oestrogen, which is typically seen as a female hormone, and testosterone, similarly seen as a male one, play a role in shaping the neural circuits in the developing brain, and that much of that moulding takes place before birth. It has also been established that testosterone, as well as being a fully functional hormone in its own right, can be (and often is) converted into oestrogen in the body. …

The battle of the sexes: Face off

A disease-free society helps effeminate men attract women

IT IS not just a sense of fairness that seems to be calibrated to social circumstances (see article). Mating preferences, too, vary with a society’s level of economic development. That, at least, is the conclusion of a study by Ben Jones and Lisa DeBruine of Aberdeen University, in Scotland, published this week in the Proceedings of the Royal Society.

Dr Jones and Dr DeBruine, themselves a married couple, examined what might be called the Deianira paradox. Hercules, demigod and paragon of masculinity in the ancient world, was indirectly done for by his own sexual prowess—his jealous wife, Deianira, accidentally poisoned him with a potion she thought would render him eternally faithful. Deianira’s predicament is a woman’s ultimate dilemma. In a man, the craggy physical characteristics associated with masculinity often indicate a strong immune system and thus a likelihood of his producing healthier offspring than his softer-featured confreres will. But such men are also more promiscuous and do not care as much about long-term relationships, leaving women to raise their kids alone. …