read more about menstruation http://www.healthorum.com/2013/03/menstruation.html
To the guys out there, do you ever joke with your friends about how difficult women can be sometimes? And for all the women, do you ever wish you could give your guy a "hint" without being too direct? Here's the answer we came up with. A whimsical arrangement based on relationships and all those subtle hints that go into the, "Battle of the Sexes"