Indeed, a certain proportion of adults of most insect species fail to locate mates. Many of these components of mating systems are mediated through neuroendocrinological mechanisms. The idea of neuroendocrine systems draws attention to the physiological basis of insect mating systems. A very common example comes from considering the roles and actions of sex pheromones in the mate-seeking phases of mating systems. Lurking behind these components, or phases, of mating systems is still another aspect of insect reproduction.
Males have another evolutionary issue.
Beyond locating, courting, and mating females, males are constrained by a need to assure the paternity of self. Strong selective pressures seem to favor mechanisms that assure an individual's paternity. I would just speculate that individuals lacking paternity assurance mechanisms would probably not be well represented in succeeding generations. Insects express many behavioral mechanisms, such as mate guarding, to assure an individual's paternity. Insect also elaborate a number of biochemical and physiological mechanisms to enhance an individual's chances of assuring paternity.