The Sensitive Regions
This should be fairly straightforward. I think most people know this stuff anyway. The most sensitive parts of my vaginal unit are the insides of my labia and all the moist parts of the vulva, with the clitoris obviously being a special, especially sensitive organ unto itself. The clitoris is capable of generating physical, sexual sensations, while the other parts are merely suggestive. They can be ticklish, especially the outsides of my outer labia. The actual opening of my vagina is also reasonably sensitive to touch, to temperature and to pressure. For about an inch (2-3cm) inside itself, it can feel all those things. I find that stretching is what it can feel the most. In the depths of my vagina, I can really only feel pressure, and not very much. This means that I can use internal menstrual products without noticing them. It also means that while I sometimes get sore around the opening of my vagina, the inner reaches barely ever feel anything. Sometime I worry that some patch inside me could be rubbed raw and near to bleeding and I just haven't noticed it.