  Sexual selection is a fundamental aspect of evolution for all eukaryotic
organisms with mating types. This paper suggests intersexual selection is best
viewed as a mechanism to compensate for the unavoidable dynamics of coevolution
between sexes that emerge with isogamy. Using the NK model of fitness
landscapes, the conditions under which allosomes emerge are first explored.
This extends previous work on the evolution of sex where the fitness landscape
smoothing of a rudimentary form of the Baldwin effect is suggested as the
underlying cause. The NKCS model of coevolution is then used to show how
varying fitness landscape size, ruggedness, and connectedness can vary the
conditions under which a very simple sexual selection mechanism proves
beneficial. This is found to be the case whether one or both sexes exploit
sexual selection.
