Word: sex
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...question is familiar, inevitable, and universal. It arises from your uncles at Thanksgiving, from your high school classmates that you run into when you are back home buying dental floss, and from every member of the opposite sex that you meet in a bar once they figure out what “a school in Boston” means...
...embrace every item of their platform. Immigration, taxes and abortion cannot all be easily resolved with a firm “no.” How about taxing things we want less of (pollution) and decreasing payroll taxes accordingly, making adoption easier, and promoting a realistic sex education...
Changes in four aspects of population structure are key: (1) sex ratio, (2) age structure, (3) kinship systems, and (4) income distribution...
...Sex ratios are becoming increasingly unbalanced in many parts of the world, especially in China and India (which account for 37 percent of the global population). The normal sex ratio at birth is roughly 106 males for every 100 females, but it may presently be as high as 120 for young people in China, or as high as 111 in India. This shift may arise from preferential abortion or the neglect of baby girls relative to boys. Gender imbalance may also have other determinants, such as large-scale migration of one or the other sex in search...
This shift in gender ratios may have other, less heralded implications, however. Some of our own work has suggested that this shift may actually shorten men’s lives, reversing some of the historic progress our species has made in recent centuries. Across a range of species, skewed sex ratios result in intensified competition for sexual partners and this induces stress for the supernumerary sex. In humans, it seems, a 5 percent excess of males at the time of sexual maturity shortens the survival of men by about three months in late life, which is a very substantial loss...