There are 1.75 million animal species that have been noted and named by our scientific classification system. Of them, there are 5,800 types of mammal. All mammals are warm-blooded and have a four-chambered heart, but so do birds. Most mammals give birth to live young, but there are exceptions to that. Mammals all have hair, but again they share that trait with other creatures–in this case spiders. In fact there is only one truly defining characteristic of mammals that is unique, and that is the trait for with they are named: the mammary gland. All mammalian species posses a gland that secretes or oozes milk for the repast of their young. In most cases the mammary gland becomes enlarged during lactation, and diminishes to almost unnoticeable when the milk is unneeded. However, amidst all 5,800 mammals, there is only one species that has perpetually swollen mammary glands. Odds are you are a member of this strangely anomalous, difficult to explain species.
At first glance the human breast defies explanation, but there are those who have spent careers and lifetimes in pursuit of explaining the relative enormity of the bust. Theories about the abundance abound. As of yet there is no consensus as to why the human female is so endowed, but staying abreast of the emerging ideas can make for titillating research.
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Monday, May 14, 2007
Staying Abreast of Human Sexuality
Labels:
Human Evolution,
Human Sexuality
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