['Freud implied a link between inability to have a vaginal orgasm and psychosexual immaturity. Since Kinsey, many sexologists have asserted that no such link exists. However, empirical testing of the issue has been lacking.', 'The objective was to determine the relationship between different sexual behavior triggers of female orgasm and use of immature psychological defense mechanisms.', 'Women reported their past month frequency of different sexual behaviors and corresponding orgasm rates and completed the Defense Style Questionnaire (DSQ-40).', 'The association between ability to have vaginal intercourse orgasm (versus clitoral orgasm) and the use of DSQ-40 immature psychological defense mechanisms (associated with various psychopathologies) was examined.', 'In a sample of 94 healthy Portuguese women, vaginal orgasm (triggered solely by penile-vaginal intercourse) was associated with less use of DSQ-40 immature defenses. Vaginal orgasm was associated with less somatization, dissociation, displacement, autistic fantasy, devaluation, and isolation of affect. Orgasm from clitoral stimulation or combined clitoral-intercourse stimulation was not associated with less use of immature defenses, and was associated with more use of some immature defenses. In one regression analysis, more masturbation and less vaginal orgasm consistency made independent contributions to the statistical prediction of immature defenses. In another regression analysis, any use of extrinsic clitoral stimulation for intercourse orgasm, and lack of any vaginal orgasm, made independent contributions to the statistical prediction of immature defenses. Vaginally anorgasmic women had immature defenses scores comparable to those of established (depression, social anxiety disorder, panic disorder, and obsessive-compulsive disorder) outpatient psychiatric groups. Results were not confounded by social desirability responding or relationship quality.'] Is vaginal orgasm associated with less use of immature psychological defense mechanisms?