Since there is no charter there is no official purpose. The unofficial purpose depends on whether you are a man or a woman. Nobody reads soc.women. There is one exception. The short answer is - everybody.
Women are half the population.
They are in every occupation except male prostitution. All topics impact women. Ergo soc.women is relevant to all topics. However there are certain groups that are cross-posted to soc.women most of the time. Populated by men obsessed with hating feminism and women who love to hate them.