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A peacock displays his long, colored tail, an example of secondary sex characteristics. An adult human's Adam's apple, a visible secondary sex characteristic common in males. A secondary sex characteristic is a physical characteristic of an organism that is related to or derived from its sex, but not directly part of its reproductive system. [1]
Sexual characteristics are physical traits of an organism (typically of a sexually dimorphic organism) which are indicative of or resultant from biological sexual factors. These include both primary sex characteristics , such as gonads , and secondary sex characteristics .
Sexual dimorphism is the condition where sexes of the same species exhibit different morphological characteristics, including characteristics not directly involved in reproduction. [1] The condition occurs in most dioecious species, which consist of most animals and some plants.
It is by means of a series of identifications that the personality is constituted and specified. The roots of the concept can be found in Freud's writings. The three most prominent concepts of identification as described by Freud are: primary identification, narcissistic (secondary) identification and partial (secondary) identification. [1]
However, secondary sexual characteristics in human males do not always enhance overall attractiveness to females. [91] [92] [93] Some traits of human males that function in contests, such as body size, strength, and weaponry usage, may also have been selected to aid in hunting. [49]
Secondary sexual characteristics are traits that distinguish the two sexes of a species, but that are not directly part of the reproductive system. Some have argued that in general they evolved to give an individual an advantage over its rivals in courtship. They are opposed to the primary sexual characteristics: the sex organs