By Alan F. Dixson
Comparative analyses of the anatomy, reproductive body structure, and behavior of extant primates and different mammals can provide vital insights into the origins of human sexual behaviour, permitting us to reconstruct the origins of human mating platforms, the evolution of sexual acceptance, styles of mate selection, and copulatory behaviour. Sexual choice and the Origins of Human Mating Systems presents a latest synthesis of analysis at the evolution of human mating platforms, bringing jointly paintings on reproductive body structure, behavioural biology, anthropology, primatology, palaeontology, evolutionary psychology, and sexological examine. The technique taken is certainly cross-disciplinary in scope, and gives a desirable account of the results of sexual choice upon human evolution within the gentle of the most recent advances within the box.
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Extra info for Sexual Selection and the Origins of Human Mating Systems
Example text
Although our modern technology is obviously much more advanced, fundamentally, as regards sexual behaviour we share many traits with our remote ancestors. The origins of some of these sexual traits, as determinants of the mating system, patterns of copulatory behaviour and mate choice are explored in the next eight chapters. CHAPTER 2 Making Holes in the Dark Sexual selection has played a major role in the evolution of the reproductive organs of animals. A full appreciation of this aspect of sexual selection is relatively new, however, and was unknown to Darwin at the time he formulated his theories concerning the pre-copulatory aspects of selection.
If so, how do measurements of these same traits in Homo sapiens fit within the broader, comparative analyses? g. concerning sexual dimorphism in body size in extinct hominids), outlined in the previous chapter? Consideration of these questions begins here with an examination of relationships between testes weight, body weight, and mating systems, as this also provides a useful entry point to the history of studies on sexual selection and genitalic evolution in mammals, including human beings. Primates, like other mammals, exhibit large interspecific differences in their testes sizes, in relation to adult body weight.
Independently, Short reasoned that differences in testes sizes between the various apes and man might reflect variations in their mating systems and sperm production in relation to patterns of sexual behaviour. He was especially struck by the modest size of the testes in the gorilla, by comparison with those of its much smaller relative, the chimpanzee. Gorillas usually live in polygynous one-male units; females mate primarily with a single partner and copulations are relatively infrequent under natural conditions (Schaller 1963; Harcourt et al.