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There are lots of advantages to sexual reproduction but how it originated is, like the origin of life itself, unknown. Although, it probably first occurred in a single celled eukaryote. It may have orginated from a mechanism to exchange genetic material between cells, bacteria do something similar. Another theory is that one cell ate another but incorparated some of its DNA into its own insted of digesting it all.
Males of species are thought of as the ones that produce many small gametes and the females produce fewer large gametes.
You're not reading the replies are you?
Asyncritus, your tone comes off as quite angry. Why does the lack of a full and comprehensive explanation of the evolution of the sexes bother you so much? Do you have an explanation you feel is superior? If so, please detail it in full.
I think Bryan's question still stands, though, kindly supply your explanation for how the sexes arose. There may be an element of speculation in the above, all within the biological rules of evolution, but I expect that your explanation will involve speculation outside the rules of reality, i.e. a divine intervention of sorts.
If it didn't reform properly and correctly, then abormalities would result, and the species would perish or deteriorate severely.
These are tiny aquatic organisms that have not had sex for over 80 million years!