This review attempts a critical evaluation of experiments dealing with the process of coitus, and highlights the features which are common to many mammalian copulations. Data for blood pressure changes in the dog and bitch during coitus have been re-analysed and compared with findings for the human. Four criteria for orgasm are suggested, and these are traced through the mammalian kingdom for possible similarities. The question of female climax is discussed and its temporal and qualitative aspects are outlined in relation to the male climax.
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