Menstruation: What is the evolutionary or biological purpose of having periods?

souleeater:

chichirinoda:

thisfeliciaday:

This is horrifying hahaha. (Via @amberbenson)

LOL, I always wondered this and apparently the answer is more terrible than I ever imagined. GDIT Evolution.

FUCKING HELL, I SUDDENLY APPRECIATE MY MOTHER SO MUCH MORE

(via cthulhu-with-a-fez)

Tags: periods are shitty respect the women in your life because they suffer through this fear our badassery