> Some people are left-handed, some people have red hair, some people are gay. This is fundamentally different. I'm pretty sure if the entire population of a s

> Some people are left-handed, some people have red hair, some people are gay. This is fundamentally different. I'm pretty sure if the entire population of a species was left handed or had red hair it would still survive. > since neither a single partner or no partner is optimal for survival. Single partner may be more optimal for survival when offspring don't mature in a matter of weeks, months or even years.