so let me start off saying that imnot the most experienced, but ive had sex with 3 girls(all for months at a time, as they were my girlfrineds). Anyways, my current gf about 3-4" inside, on the top, theres something about the size of a nickle wiht a small dimple in teh center. Its soft on the outside, but its firm in its place... she doesnt respond from any pressure or rubbing on it, but i asked her if it hurts, and she said no. She cant feel it cause her fingers aren't long enough. Anyways---be easy on me, but what is it?