Researchers theorize that many women feeling this sensation hold back their sexual response to keep from wetting on their partners, which may explain why up to 25 percent of American women never have orgasm. While all women have the same basic labia structure, like snowflakes no two are exactly the same. Some labia's have been described as ranging from the delicate petals of an orchid to like the tail of a tropical fish. The clit may be deeply hidden or large and easy to see and stimulate. With stimulation the physical reactions can be beautiful to witness.
Blood engorges the tissues and the lips swell and become redder or darker.
Too many men agonize over their size of their penis. It seems the issue is more important to men, comparing themselves to other men, than to the women who really count. Hitting the back wall of the vagina can cause sharp pain. Many women with small vaginas much prefer shallow strokes. The most sensitive part of the penis and vagina is at the tip and entrance.