A blog says:
“The model proposed by Christopher Ryan in “Sex at Dawn” (the women in a group have sex with the men in their group, and uncertain paternity leads all of the men to feel responsible for providing for the children) …”
That doesn’t require group selection.
A blog says:
“The model proposed by Christopher Ryan in “Sex at Dawn” (the women in a group have sex with the men in their group, and uncertain paternity leads all of the men to feel responsible for providing for the children) …”
That doesn’t require group selection.