My girlfriend told me that she had experienced double penetration with two guy before. What does it mean that?

I don't know what to think about this. I have been in a relationship with her for about 2 years. When she told me this, she wasn't drunk or anything. She told me I needed to know that.

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Heey.. I know what Double Penetration means! I just wanted to say I'm confused about my girlfriend experiencing this.
My girlfriend told me that she had experienced double penetration with two guy before. What does it mean that?
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