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The study published on Tuesday in the journal PLOS Biology showed that a kind of chemical could make X-bearing sperm slow-swimmers without affecting their fertilization ability, thus screening them from the Y-bearing ones. Most cells from male mammals contain both an X and a Y chromosome, but during sperm development, the X and Y chromosomes are segregated into different cells so that an individual sperm will carry either one or the other, with an X chromosome giving rise to daughters and a Y chromosome to sons. The researchers from Hiroshima University found that the X chromosome carries much more genes than the Y chromosome and some of those genes remain active in the maturing sperm.

The United States is again ranked as one of the worst countries in the world for human trafficking. According to a recently released report by the State Department, the top three nations of origin for victims of human trafficking in were the United States, Mexico and the Philippines. Over the last two months, Fox News has investigated human trafficking.

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In this fascinating book Giulia Sissa looks at sensuality and sexual desire in the Greek, Roman, and early Christian worlds, demonstrating how modern concepts of sexuality have emerged from the practices and theories of ancient times. Countering the assumptions of many other scholars, Sissa emphasizes the centrality of heterosexual desire and passion in the classical period, arguing that the importance of homosexuality has been overemphasized. Drawing widely on contemporary literature and philosophy, Sissa examines each culture in turn, arriving at a variety of fresh insights.

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This map shows worldwide human sex ratio for the total population. Sex ratio is the number of males for each female. Current world sex ratio for the total population: 1.

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Add to Cart. Looking at sex and sexuality from a variety of historical, sociological and theoretical perspectives, as represented in a variety of media, Sex in Antiquity represents a vibrant picture of the discipline of ancient gender and sexuality studies, showcasing the work of leading international scholars as well as that of emerging talents and new voices. Sexuality and gender in the ancient world is an area of research that has grown quickly with often sudden shifts in focus and theoretical standpoints. This volume contextualises these shifts while putting in place new ideas and avenues of exploration that further develop this lively field or set of disciplines.

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The ratio between the number of males and females in a society is referred to as the gender ratio. This ratio is not stable but instead shaped by biological, social, technological, cultural, and economic forces. And in turn the gender ratio itself has an impact on society, demography, and the economy.

Powerful men, van der Dennen says, "just take what they want. Is there a normal percentage of oversexed people among powerful men, and it's just easier to notice their lapses, their misconduct, because they are so visible? Van der Dennen: Both may be true.

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