However, other research seems to say that a long penis that touches and sexually excites the fornix, which is the deepest part of the vagina near the cervix (the opening of the uterus into the vagina), helps a woman to have an orgasm. A study from the Netherlands of 375 women came out in 2002. This study said that although 77% of the women felt that the length of a man's penis was not important to them, quite a large number – 21% – felt it was important.