Hypothetical role of men's sexual activity in the regulation of human sex ratio: Analysis of the sex ratio of post-war abandoned children |
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Authors: | Denis Rousseau |
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Affiliation: | Institut de Recherches en Technologies et Sciences pour le Vivant - Commissariat à l'Energie Atomique - Laboratoire Biochimie et Biophysique des Systèmes Intégrés, UMR5092 CNRS-CEA-UJF, DRDC CENG 17 rue des Martyrs, 38054 GRENOBLE Cedex 09, France |
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Abstract: | The regulation of the sex ratio at birth in human species remains poorly understood. After wars, a shift of the sex ratio in favor of men is always observed. Among the different hypothesis to explain this observation, one is to consider that Y-bearing spermatozoids have a weight advantage following insemination and that X-bearing spermatozoids, heavier, are more time-resistant. Following these observations, frequent sex may favor the birth of boys, whether infrequent sex may favor the birth of girls.Sustaining this sperm weight hypothesis, I report here that in France, after the two world wars, there has been an increase of abandoned illegitimate children with a significant shift of the sex ratio in favor of men. These observations may reflect an increase in illegitimate birth and indirectly an increase of men paternity. |
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Keywords: | Sex ratio Abstinence |
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