Ratio of men to women on dating sites

In most populations, adult males tend to have higher death rates than adult females of the same age (even after allowing for causes specific to females such as death in childbirth), both due to natural causes such as heart attacks and strokes, which account for by far the majority of deaths, and also to violent causes, such as homicide and warfare, resulting in higher life expectancy of females.

For example, in the United States, as of 2006, an adult non-elderly male is 3 to 6 times more likely to become a victim of a homicide and 2.5 to 3.5 times more likely to die in an accident than a female of the same age.

Angola, Botswana and Namibia have reported birth sex ratios between 94 and 99, which is quite different than the presumed "normal" sex ratio, meaning that significantly more girls have been born in such societies.Infant mortality is higher in boys than girls in most parts of the world.This has been explained by sex differences in genetic and biological makeup, with boys being biologically weaker and more susceptible to diseases and premature death.Over 1000 articles have been published in various journals. The scientific studies are based on extensive birth and death records in Africa, the Americas, Asia, Australia, and Europe.Two of the often cited reviews of scientific studies on human sex ratio are by W. A few of these studies extend to over 100 years of yearly human sex ratio data for some countries.

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