There is every reason to believe that higher female agreeableness is due biological sex differences, given 1. the evidence, which I'd be happy to share if you'

There is every reason to believe that higher female agreeableness is due biological sex differences, given 1. the evidence, which I'd be happy to share if you're actually open to having your views changed 2. females bear children and have been the primary caregivers of young children throughout all of human evolution, which is going to apply massive selective pressure for sex-mediated traits in females conducive to nurturing children, like agreeableness