Why the human penis is larger than in the great apes.
D000818:Animals; D000886:Anthropometry; D005075:Biological Evolution; D002755:Choice Behavior; D003075:Coitus / Q000502:physiology; D005260:Female; D015186:Hominidae; D006801:Humans; D008297:Male; D010413:Penis / Q000033:anatomy & histology*; D010549:Personal Satisfaction; D014621:Vagina / Q000033:anatomy & histology