For the first time in my Friday Feminist series, a very-much contemporary feminist, and blogger. Melissa has a page full of Feminism 101, which you should read in its kick-ass entirety, and she is blogmistress of Shakesville, a diverse community of progressive writers.
On Periods: Let's put this shit to bed right now: Women don't lose their minds when they have period-related irritability. It doesn't lower their ability to reason; it lowers their patience and, hence, tolerance for bullshit. If an issue comes up a lot during "that time of the month," that doesn't mean she only cares about it once a month; it means she's bothered by it all the time and lacks the capacity, once a month, to shove it down and bury it beneath six gulps of willful silence.
Melissa McEwan, "On Periods"