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Sperm competition in humans
Vydarená, Eliška ; Havlíček, Jan (advisor) ; Tomášek, Oldřich (referee)
Sperm competition has been observed and studied many times in a lots of animal species. It is currently also being considered in humans. Despite the number of studies, most of them were mainly focused on insects and birds. So far, only a small number of studies have dealt with sperm competition research in humans. For this reason, the question if sperm competition appeared and had selection pressure for the creation of various adaptations even in human evolution remains a controversial topic. In this bachelor thesis, I summarize the current knowledge of sperm competition in humans, the frequency of extra-pair copulation and paternity, and in individual chapters to indicate what adaptations to sperm competition may have developed in humans during their development. Key words Sperm competition, human sexuality, sperm, reproductive strategies
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Sexual disgust in an evolutionary perspective
Šeda, Jan ; Kaňková, Šárka (advisor) ; Kuncová, Lucie (referee)
Disgust is one of the basic human emotions, its purpose being protection of individuals from situations that could potentially harm them. Disgust can also play a part in many mental disorders. One of the domains of disgust is sexual disgust, which allows an individual to choose the optimal sexual partner and to distance themselves from other individuals who exhibit inappropriate sexual behavior. The sexual disgust sensitivity is influenced by a range of individual factors, such as political orientation, religion, culture and social norms, personality differences, preferred reproductive strategies and gender. Higher average rate of sexual disgust has been observed in women than in men, which is related to their different sexual and social lives. Disgust also plays an important role in prejudice against homosexuals. Keywords: sexual disgust, mating strategies, homosexuality, basic emotions, adaptive behavior
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