Last I heard there was still some ongoing debate among ev biologists about whether group selection was an important effect or not; I think the general consensus tends to be that it's a pretty small effect except in certain special cases.
The existence of traits like courage is far better explained by sexual selection. Women throughout history have always strongly preferred courageous men to cowardly ones. This is only partially cancelled out by the fact that courageous men tend to die more often.
As civilization continues to advance, and fewer and fewer people die before childbearing age, I'd expect the balance between sexual selection and survival selection to tip even more strongly in favour of sexual selection, so it's quite likely that (even absent widespread genetic modification) the people of the future will indeed tend to be "sexier" than the people of the present.
(Partially cancelling this out is the idiocracy effect whereby poor dumb folks have more children; I can't estimate which is more powerful.)
>The existence of traits like courage is far better explained by sexual selection. Women throughout history have always strongly preferred courageous men to cowardly ones.
That's not an explanation. Why do women prefer courageous men?
Do you mean to imply that courage is like a Peacock's tail? It doesn't help a man survive, but it signals that he must be really good at surviving in other ways.
The existence of traits like courage is far better explained by sexual selection. Women throughout history have always strongly preferred courageous men to cowardly ones. This is only partially cancelled out by the fact that courageous men tend to die more often.
As civilization continues to advance, and fewer and fewer people die before childbearing age, I'd expect the balance between sexual selection and survival selection to tip even more strongly in favour of sexual selection, so it's quite likely that (even absent widespread genetic modification) the people of the future will indeed tend to be "sexier" than the people of the present.
(Partially cancelling this out is the idiocracy effect whereby poor dumb folks have more children; I can't estimate which is more powerful.)