I had to wonder if that was true for e-mailing? To get the answer, I simply observed Jenny and Cassie continuing their friendship as if the International Dateline didn't exist.
Click on the comic strip or just go to jennyspouse.com for a larger version.
( Note: the truth is, after a six-year study on this very subject, it was found that women spoke a daily average of 16,215 words in their waking hours; men, 15,669. Not that big of a difference...I think the first statistics are more fun. Here's the study.)