It turns out that woman really do talk more than men. 2,700 words more a day in fact. A study found that on average:
male = 6073 words per day.
female = 8805 words per day.
This makes sense if you think about it based on our hunter gather roots. Back then men were hunters which relied on stealth and minimal conversation where as women were gathers which allowed for plenty of conversation.
Estimates based on a study that is at the bottom of the linked page: