Girls, Does anyone know about vaginismus?

My girlfriend and I had sex last night. We had a long foreplay. We kissed for a while. Then I gave her oral. I moved my penis back and forth between her vagina lips. It was very slippery and wet. But when I tried to put it inside, it didn't go in. We did some research and learned that it was vaginismus. How is it treated?

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Girls, Does anyone know about vaginismus?
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