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An active sex life is associated with health benefits, including increased blood levels of the antibody Immunoglobulin A and improved hormone balance. It also promotes regular menstrual cycles and reduces the negative symptoms of menopause.
The origins of adult sex can be traced back billions of years. One theory suggests that sex arose from the need for organisms to ensure that they reproduce as adults. Sexual reproduction allows adultfucks to be copied and exchanged between cells, making it less likely that certain parts of the would be damaged and prevent the cell from reproducing.
Another theory is that sex emerged as a mechanism for adult sexual desire against invading microorganisms. Eukaryotes reproduce both asexually and sexually, but it seems likely that even eukaryotes that today exclusively reproduce asexually all had sex in their ancestral history. Recent studies of spores of asexually reproducing adult algae have shown that they have “male” and “female” cells like those used for sexual reproduction. The evolution of adult sex is a complex process. Environmental changes are the driving force behind adaptation, but not all are the same: some require the development of entirely new genes, while others affect only parts of the genome. Moreover, these evolutionary changes are not symmetric, and individuals may suffer more or less fitness loss depending on their genotype. To gain a deeper understanding of this phenomenon, researchers have adapted replicate populations of adult sex to environments that differ from their native environments in one, two, or three environmental aspects. They then used measures of growth and reproduction to compare increases and decreases in fitness for different genotypes.
The prevailing hypothesis for the evolutionary maintenance of sex in adults is that sex facilitates adaptation to changing environments. However, this explanation does not explain why adult sex persists even in genetically identical offspring. This adult sex has led some scientists to propose alternative hypotheses. One such theory, proposed by adultfucks Williams, is based on the principle of “sibling competition”, in which offspring compete for resources and the chances of a seed succeeding in occupying a vacant spot depend on its genotype. Siblings with the same genotype do not use resources in the same way, so natural selection favors parents that produce diverse offspring.
Another theory is that sex evolved in adults as an adaptive response to parasites. According to this view, sex gives sexless adults an advantage in defending against parasites by endowing them with new gene combinations that confer resistance to certain parasites. This mechanism seems especially important when the environment changes rapidly, which could cause previously neutral or deleterious alleles to become sexually active over time in adults.
Another “informational” view of sex in adultfucks is that it evolved as an adaptive response to two main sources of “noise” in the transmission of genetic information: physical damage to the genome.
