I think the social and biological aspects play a role in shaping the individual's disposition, certainly.
Not true. Even in a model like that which focuses on evolutionary drives, males are selective for certain traits equated with fertility in their partners, such as certain body types and a certain age range.
Furthermore, even granting your incorrect statement, how does attraction to legs play into wanting to spread one's seed as much as possible? In your system that's already a detail, so we're talking about details of details.