That's quite interesting. I would assume that polygamous tribes would be much more successful; if the biggest, fiercest chief gets ten wives instead of one, you

That's quite interesting. I would assume that polygamous tribes would be much more successful; if the biggest, fiercest chief gets ten wives instead of one, you've got to assume that there are going to be lots of little fierce ones toddling around, making the tribe more competitive. On the other hand, they might just end up killing each other, so polygamy could be useful if there's a more benign trait being bred for, like IQ. Perhaps extremely wealthy polymaths who like to fool around (e.g. http://www.dealbreaker.com/jeffrey_epstein/ http://www.dealbreaker.com/jeffrey_epstein/ and http://www.newyorker.com/reporting/2007/10/15/071015fa_fact_cassidy http://www.newyorker.com/reporting/2007/10/15/071015fa_fact_... ) are the future.