... Female reproduction can be halted by celibacy or infertility or delayed by the use of contraception, and lactation can be avoided by using infant formula. The strength of males can diminish as machinery becomes available to do the heavy work. The aggressiveness of young males, though valuable for defence can become socially disruptive if there is no need for local troops. Behavioural differences between boys and girls can be reduced in later childhood when they are raised together and boys perform tasks defined as feminine. Thus the existence of gender specific capacities does not predict how or to what extent they will be used for purposes of adaptation. (Nadelson, pg 4, 1991) Field work carried out by anthropologists within non Western societies provide support for this point, in the East African highlands, where ploughs and animals are absent, the heavy work of cultivation is done largely by women. The same women ...

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