Abstract Introduction In 1948 Alfred Kinsey’s investigation of female and male sexuality found that 80% of women reached orgasm mainly through non-coital sexual experiences, such as oral and physical manipulation of the genitals or through sex toys. After that many peer-reviewed studies confirmed these data as well as in our practice. However, the question remains; what happened with the other 20% that reached orgasm through vaginal penetration. Objective To describe the epidemiological sexual characteristics of the 20% of women who reached orgasm mainly through vaginal penetration. Methods Over 3000 sexual histories were done in our medical center and were used to collect data regarding the reasons for the orgasm obtained through vaginal penetration. This study includes retrospective and prospective questionnaires applied to all patients seen in our centers. Results The epidemiological sexual characteristic of this specific group of women are: - 75% have had only one sexual partner in their lives - 20% of them have had two sexual partners in their life and - 5% of them have more than two. It has been very scantly found that women with a history of multiple sexual partners enjoy sexual penetration. The orgasmic response resulting from coital sex was more persistent and presently found while the number of sexual partners was less. Increased orgasmic responsiveness was also present when the initiation of the sexual activity with the partner was earlier in life. Conclusions When the sexual development of a woman is allowed to mature in the presence of a lifelong partner. Their response to penetrative vaginal stimuli is better and the obtention of sexual pleasure and orgasm reinforce this response that persists throughout life and is more attainable over any other form of vaginal stimulation. Disclosure No