Biologists today still believe that “the evolution of sex” is the most important question under discussion. Despite the obvious benefits, sexual reproduction represents a more expensive and inefficient means of reproduction. Asexual reproduction does not require any expensive means to reproduce, nor is it necessary to combine one's genetic make-up with another male or female. Asexual organisms have the ability to grow twice as fast as sexually reproducing organisms. A population that reproduces sexually must, in fact, produce both sexes, which means that only 50% of them are capable of giving birth alone. In contrast to populations that reproduce asexually, 100% of their offspring can potentially give birth. This analogy is called double costing. So the question remains, given the advantages of asexual reproduction, why do most organisms prefer to reproduce sexually? The issue presented was called the sex paradox. There are multiple mechanisms needed to try to explain the emergence and maintenance of sexual reproduction. “Among the many explanations that have been posed for the prevalence of recombination and sex, a few are considered the most likely.” (Kondrashov 1993). Muller's Ratchet, adaptation to fluctuating environments, and an increased rate of adaptation may just be the answer to how sex evolved. Can these theories be good enough to outweigh the cost of sex? Or will it take a combination of all the theories to solve the biggest mystery of all, sex? Over the course of several years, evolutionists have tried to explain the reality of sexual reproduction by promoting genetic variability. However, this explanation is not only incorrect, but also has some disadvantages. Sexual reproduction occurs through the formation of g...... half of paper ...... cockroach combining all three of these mechanisms may be necessary to fully balance the dual cost of sex. (West, Lively, Read) Mutation accumulation theory requires that mutation rates be high, (Kondrashov, 1993 Deleterious mutations and the evolution of sexual reproduction), each deleterious mutation will lead to a decrease in logarithmic fitness compared to the previous one, and the population size must be large for it to work properly. While some models may not be able to fully explain the dual cost of sex, it may play an important role. A pluralistic approach helps to “shift the emphasis of empirical work from the search for discriminating predictions to parameter estimation.” This approach also “emphasizes that environmental and mutational mechanisms interact synergistically in various ways and overcome each other's weaknesses.” (West, Livley, Read)