Vagina's acting weird

I didn't know how else to title this, lol. But I was thinking about before I hit the age where I started to masturbate, if I thought about sex or anything like that, my lower region would begin to "pulse" and I only say that because I don't know how else to describe it. I remember it feeling great but I haven't experienced it in years because I just always masturbate when I get in the mood now. The only other time I've felt it is when my boyfriend gave me head just a couple weeks ago. Does anyone know what this is? It's like a pounding in your vagina, it doesn't hurt or anything. Has anyone else experienced it? 😳

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