Enact Woman's Suffrage is a decision that can be taken by all civilized nations, that has elections. It shows up in the decision tab after 1870, and can be taken once a list of conditions are met 1) the nation has researched Social Science and Revolution & Counterrevolution 2) the upper house has to be at least 30% socialist or 30% liberal 3) and either at least 15% of the population wants a voting reform or the country has universal voting 4) average consciousness is at least 4
It reduces war exhaustion by 2 and makes some changes to the voting patterns. The rich (
capitalists and 
aristocrats) vote counts 1% less. The middle strata (
officers, clergy, 
bureaucrats, 
clerks and 
artisans) vote counts 2% more. The poor population (
craftsmen, 
farmers, 
labourers and 
soldiers) vote 5% more. It also reduces militancy in all non-colonial states by 0.02 pr. month. The effect lasts until the end of the game, or until the Government type changes to one without elections.
Since every POP represents a nuclear family, there isn't actually any women in the game.