“The maintenance of sexual reproduction in a highly competitive world has long been one of the major mysteries of biology given that asexual reproduction can reproduce much more quickly as 50% of offspring in sexual reproduction are males, unable to produce offspring themselves.”
Put another way, from an evolutionary perspective, sexual reproduction would need to provide an advantage of more than 50% to be maintained as viable in the long term.
Several theories have been proposed. A 2015 hypothesis (from the University of East Anglia, UK) suggests that :
“In the absence of sex, populations accumulate deleterious mutations through a ratcheting effect where each new mutation takes a population closer to extinction. Sexual selection helps to remove those mutations, enabling populations to persist against the threat of extinction.”
There are however many organisms that have maintained extensively successful populations over millions of years apparently asexually, see wikipedia
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