The Effects of Sexual Excitement Induced by Visual Erotic Stimulation on Serum Dopamine and Testosterone / 대한남성과학회지

PURPOSE: Male sexual desire and erection are directly or indirectly affected by hormone and neuroendocrine response. We investigate the changes of the serum dopamine and testosterone level by visual erotic stimulation-induced sexual excitement. MATERIALS AND METHODS: The age of volunteers was ranged from 25 to 65 years, with an average of 45.5years. Serum were collected at rest and after visual erotic stimulation. Sexual excitement induced by erotic film for 30 minutes and erectile status was monitored by Rigiscan. The response of visual erotic stimulation were divided into three groups according to degree of sexual excitement. i.e. no response (Group I), mild excitement(Group II), excitement (Group III). RESULTS: Although some changes were observed in serum dopamine and testosterone level of all 32 patients after visual erotic stimulation, it did not showed statistically signigicant change (p=0.450, p=0.058). According to excitement response, group I and II were not showed statistically significant change in both dopamine and testosterone. Only dopamine of the group III was showed statistically change (dopamine: p=0.041, testosteron: p=0.257) CONCLUSIONS: In this study, serum testosterone level is not showed significant change irrespective of the degree of sexual excitement induced by visual erotic stimulation. However, serum dopamine was changed with statistically significance only in sexual excitement group.

Problems with interpretation of primary diagnostic tests for impotence / 대한비뇨기과학회지

We analyzed the practical problems and factors which affect making the correct differential diagnosis in the interpretation or test results from the nocturnal penile tumescence (NPT) test and erotic stimulation test (EST). This was done to provide better information for higher diagnostic accuracy in the clinical application of these tests. The followings are the results of NPT tests and EST identifying the factors affecting correct differential diagnosis by comparison the other differential diagnostic methods. The overall sensitivity of NPT test (Number: 114 total patients) was 82%. 21 cases (18%) could not be diagnosed correctly due to traction of the sensor (12 cases, 10%) and sleep disturbance (9 cases, 8%). The overall sensitivity of EST (Number: 174 total patients) without considering the degree of patient`s sexual drive to erotic stimulation was 77%. 40 cases (23%) could not be diagnosed correctly due to tolerance to pornographic film (17 cases, 10 %), discomfort by the body attachments (14 cases, 8%) and traction of the sensor (9 cases, 5%). However, higher sensitivity (90%) and lower rate of incorrect diagnosis (10% ) were observed in 119 patients who showed Grade II or III (moderate to good) sexual drive to erotic stimulation. The results suggest that undesirable factors in the primary screening methods, traction of sensor, sleep disturbance in NPT test, and tolerance to pornographic film, discomfort by the body attachments, traction of sensor in EST must be taken into consideration when interpretation of test results is being performed.

Erectile responses to erotic stimulation in patients with erectile impotence / 대한비뇨기과학회지

We performed erotic stimulation that in 63 patients with erectile dysfunction in order to investigate erectile responses to visual sexual stimulation in patients with psychogenic and organic impotence and to elucidate valuable parameters for differential diagnosis between psychogenic and organic impotence. After the test using polygraph system and erotic film, subjective sexual drive in each patient was evaluated as grade I (poor), grade II (moderate), grade III (good). Following parameters were statistically analyzed : degree of maximal rigidity, degree of maximal tumescence, T -up phase (time taking place from the beginning of the erection to maximal level). The T-max phase (time taking place for the plateau phase of maximal erection). The results obtained were summarized as follows. Regardless of sexual drive of each patient, psychogenic impotence group showed better maximal rigidity and shorter T-up phase of rigidity than organic impotence group (p<0.05}. Of patients with psychogenic impotence, good sexual drive group showed better maximal rigidity and maximal tumescence than poor sexual drive group (p<0.06). Psychogenic impotence group showing good sexual drive revealed much better maximal rigidity and shorter T-up phase of rigidity than organic impotence group with same degree of sexual drive (p<0.05). These results indicate erotic stimulation test is highly valuable method for differential diagnosis between psychogenic and organic impotence, especially when the patient shows sexual drive in moderate or good degree. And it is suggested that maximal rigidigity and T-up phase of erection parameters in erotic stimulation test provide high validity for the differention.

Age-related Erectile Response to Short Erotic Stimulation in Normal Adults / 대한비뇨기과학회지

Simultaneous monitoring of penile photoelectric plethysmography, penile tumescences, penile rigidity, bulbocavernosus-ischiocavernosus EMG and EKG was attempted to investigate the age-related erectile response to short period erotic film in 50 normal males and to elucidate the range of its characteristics for the diagnosis of impotence. The results obtained were summarized as follows ; l. Variability was observed in temporal relationship between penile pulse amplitude and penile erection. Of the 45 subjects who showed erection and/or increase in penile pulse amplitude 4 categories of response could be defined : Type I was observed in 13 subjects (28.9%)-erection and increased penile pulse amplitude occurring in parallel ; Type II, in 26 subjects(57.8%)_erection with increased penile pulse amplitude during the development or decline of erection but not during maximum erection ; Type III, in 4 subjects(8. 8%)_erection with no change in penile pulse amplitude ; and Type IV, in 2 subjects (4.4 %)_increased penile pulse amplitude without any erection. These results suggest that penile erection does not exclusively depend increased penile arterial blood flow but upon the cooperative mechanisms with the action of venous blockade which corresponds flexibly to the degree of arterial blood flow. 2. Following erotic stimulation, there was tendency to delay in latency to erection with aging. However, no difference in penile tumescence and rigidity among age groups was observed. This indicates that if the subject is affected by libido owing to strong erotic stimulation, maximum erection ensues regardless of aging. 3. The fact that subjects with good erection shows enough libido and that maximum erection ensues if erection develop under strong erotic stimulation suggests visual sexual stimulation method would be useful in differentiatial diagnosis of erectile dysfunction.