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Sexual fluidity is one or more changes in sexuality or sexual identity (sometimes known as sexual orientation identity). Sexual orientation is stable for the vast majority of people, but some research indicates that some people may experience change in their sexual orientation, and this is slightly more likely for women than for men. [1]
This has shaped human evolution for many years, but reasons why humans choose their mates are not fully understood. Sexual selection is quite different in non-human animals than humans as they feel more of the evolutionary pressures to reproduce and can easily reject a mate. [ 2 ]
Sexual conflict underlies the evolutionary distinction between male and female. [4] The development of an evolutionary arms race can also be seen in the chase-away sexual selection model, [5] which places inter-sexual conflicts in the context of secondary sexual characteristic evolution, sensory exploitation, and female resistance. [1]
Sexual selection creates colourful differences between sexes in Goldie's bird-of-paradise.Male above; female below. Painting by John Gerrard Keulemans.. Sexual selection is a mechanism of evolution in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex ...
Our society has convinced us that there are just two options for gender identity, "male" and "female," based on biological sex. But in reality, there's more fluidity. Gender identity is on a ...
In the absence of a Y chromosome, the fetus will undergo female development. This is because of the presence of the sex-determining region of the Y chromosome, also known as the SRY gene. [5] Thus, male mammals typically have an X and a Y chromosome (XY), while female mammals typically have two X chromosomes (XX).
The first known mention of the term gender fluidity was in gender theorist Kate Bornstein's 1994 book Gender Outlaw: On Men, Women and the Rest of Us. [14] It was later used again in the 1996 book The Second Coming: A Leatherdyke Reader. [15] As society moves forward, words change and new words arise to describe different phenomena.
Evolution to resist infection of pathogens also increased inflammatory disease risk in post-Neolithic Europeans over the last 10,000 years. A study of ancient DNA estimated nature, strength, and time of onset of selections due to pathogens and also found that "the bulk of genetic adaptation occurred after the start of the Bronze Age, <4,500 ...