This relationship has not been statistically evaluated, but two historical studies provide data supporting such a relationship Narjani, ; Landis, Landis, and Bowles, In a study of more than women, Rutgers University sex researcher Dr Beverly Whipple, found that when this area was stimulated after a woman was already sexually aroused, a bump of tissue speared and could sometimes trigger an orgasm. Thus, although the penis enlarges substantially under the influence of androgens the parts which contribute to sexual sensations remain, or become, quite small. Women, by contrast show a much more gradual developmental curve. Thus there is a long history of the notion that clitoral stimulation, direct or indirect, is required for women to experience orgasm in intercourse. Can't find the email?
The two studies differed in the strength of this prediction with the Bonaparte sample providing better prediction and classification than does the Landis sample.
A guide to her vagina
Classification of subjects from the Bonaparte and Landis samples when using discriminant functions generated from either the Bonaparte or the Landis samples. Bonaparte measured the distance between the underside of the clitoral glans and the centre of the urinary meatus CUMD 2 and compared that distance to the likelihood that the woman experienced orgasm during sexual intercourse. In his view, girls initially experienced clitoral eroticism analogous to boy's penile eroticism. Possibly variation in prenatal androgens produces other genital changes, in addition to rostral migration of the genital tubercle, that influence the type of stimulation a women requires for reaching orgasm. It takes time to build the energy here - up to 30 minutes of stimulation. Although both ROCs accounted for significant area under the curve, the Bonaparte sample accounted for more area than did the Landis sample and showed greater sensitivity and specificity.