On average, males have more body hair than females. Evolutionary and Life History. Sexual dimorphism is a term for the phenotypic difference between males and females of the same species. Journal of Human Evolution. Direct being the direct result of differences prescribed by the Y-chromosome, and indirect being a characteristic influenced indirectly e. When an egg and sperm fuse at fertilizationthe two sets of chromosomes come together to form a unique " diploid " individual with 46 chromosomes. HD Experienced blonde plays solo with vibrator before drawing
However, the gap between males and females is decreasing in many developed countries as more women take up unhealthy practices that were once considered masculine like smoking and drinking alcohol.
Sex differences in human physiology
The gradual growth in sex difference throughout a person's life is a product of various hormones. On average, female brains have a larger ratio of grey matter to white matter than males particularly in dorsolateral prefrontal cortex and superior temporal gyruseven when sex-differences in total intracranial volume are taken into consideration. In contrast to connectivity to the cerebrumin the cerebellumthe part of the brain that plays a major role in motor task, males showed higher inter-hemispheric connectivity while females showed higher intra-hemispheric connectivity. Annals of Human Biology. Females have less asymmetry than males between left and right hemispheric cortical thickness. Thus during a lifetime males are able to father a significantly greater number of children than females can give birth to.