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Influence of birth order and sex of siblings on sexual behavior and preferences
Daňková, Hana ; Kuba, Radim (advisor) ; Krejčová, Lucie (referee)
Ontogeny of a human being is influenced by several innate and environmental factors. One of the key environmental factors is family, its structure, and the dynamics of family relationships. These can depend, among other things, on the birth order. Relatively a lot of research has been conducted to study the effect of birth order on humans, but the area of human sexuality is often neglected. Research in this area has so far yielded relatively inconsistent results and needs to be expanded further with new knowledge. That is the main goal of this diploma thesis. In our cross-sectional study, 4495 subjects from two-child families were analyzed. We performed a partial correlation analysis of birth order and selected variables related to human sexuality, considering the sex of siblings. Particular attention was paid to the first sexual experience, the number of sexual partners, sociosexual orientation (SOI-R), and dominant-submissive sexual preferences. We found that the order of birth is related to several of these variables (age of first sexual experience, number of sexual partners, sexual preferences), but the key role is played by the combination of the individual's gender and the sex of his sibling. These results should be followed up by more detailed research within specific families to verify the...
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