A good essay on this phenomenon: http://denisdutton.com/baumeister.htm http://denisdutton.com/baumeister.htm. In short, evolutionary biology; variance of number

A good essay on this phenomenon: http://denisdutton.com/baumeister.htm http://denisdutton.com/baumeister.htm. In short, evolutionary biology; variance of number of children in men is much higher and it makes sense to take risk (both in terms of genes and behaviour).