It has occurred to me before that there seems to be no real reason why being "ripped" would indicate a high-status male. So why do women find it more attractive than, say, someone who looks a little flabby?
I'm just theorizing here, but back in ape days, surely the leader of the tribe would not go out to hunt? If lion culture is anything to go by, the rest of the tribe would go out to hunt and be under the orders of and wait upon the tribal leader. And common sense dictates that the hunter-gatherers would be more ripped than the tribal leader?
Perhaps that's it? The tribal leader can have the pick of the women and being ripped indicates a lower status and therefore more likely to be single?