Final answer:
The amount of sexual dimorphism in humans suggests that our "natural" social group is highly variable and flexible in terms of gender and sexuality.
Step-by-step explanation:
The amount of sexual dimorphism seen in humans suggests that our "natural" social group is highly variable and flexible in terms of gender and sexuality. Research from primatology and biological anthropology indicates that humans, like nonhuman primates, exhibit a diverse range of gender and sexual expressions, and there is no clear commonality to predict what is "natural" for humans. The variability in sexual dimorphism among species and the absence of a simple correlation between anatomy and behavior emphasize the biological flexibility and cultural variability in human gender and sexuality.