By now you’ve probably heard about the YouTube star with two vaginas. But if you’re like us, her story left you with questions. Such as—why? And how?

Yes, model Cassandra Bankson, famous for her makeup tutorials, revealed in a video to her subscribers that she is “twice the woman” after finding out she has two vaginas and two uteruses, due to a very rare condition known as uterus didelphys. Although the 22-year-old released the video in 2014, it didn’t go viral until last week.

So what does having “two vaginas” really mean? We did the research behind the anatomical science so you don’t have to. Here’s what we learned.

The condition

Bankson was diagnosed with uterus didelphys, a rare condition which only affects about 1 in 2,000 women worldwide. Doctors aren’t sure why it occurs, but they do know how.

During the embryonic stage of human development, females have two tubes (uterine horn

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