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Khloé Kardashian Odom is not one to shy away from touchy subjects -- like vaginas, period myths, and her older sisters. Apparently one of them -- Kim or Kourtney -- believed that if she slept on her side for a long time, her period would stop flowing heavily. Say whatttt?!

"Ok my sister, and I am not going to say which one because it is embarrassing, but it is one of my older ones," started Khloe. "[She] told me that if you sleep on your side that...it will, like, stop heavy flow and you won't have to worry so much."

Before you start giggling and sending "lol" messages to the Kardashians, know that millions of girls around the world believe in similar myths. As part of her campaign with Generation Know, Khloe's trying to help get the truth out about periods and encourage her female fans to be a healthy and confident woman. And she wants you to get involved: For every myth you bust, $1 will be donated to Girls For A Change to support non-profit initiatives for young women locally.

Not to be outdone by her sisters, however, the wife of basketball star Lamar Odom even shared one of her own period myths with me. "I always heard that if you swim when you get your period in the ocean sharks will come and get you...and they can smell it from 7 miles away."

+ Watch Khloe Kardashian on Crazy Body Myths

OMG, I'm not sure which rumor is more WTF-worthy! Take a second to help the funniest Kardashian sister bust all these crazy myths over at Generation Know below.