One of the basic assumptions of the material presented in chapter 8 is that the

Within a population of sexually-reproducing species, there are often complex social behaviours associated with either attracting or choosing mates. These behaviours are unlikely to occur within an asexual population except, perhaps, as a remnant of a previous time when the ancestors of the population engaged in sexual reproduction. In a species having separate sexes, there are often male-specific and female-specific mating behaviors. However, in a hermaphroditic species all individuals should exhibit male and female forms of social behaviour (i.e., all individuals would be behaviourally equivalent). As the number of forms of males or females increase in a population, the diversity of behavioural interactions within the population will likely increase.