The reported frequency of sexual intercourse in this population was between 0.25 � 10 per week (mean 2.4). Evaluation of sexual function log revealed that there was good concordance between the pre-study reported frequency and logged frequency during the study period. Of the 113 men in the study, only 33 (29%) reported having some amount of spontaneous erection, but not suitable for enjoyable intercourse at Visit 1. Following sildenafil therapy, 82/99 (82.8%) men had improved erections (based on GEQ) suitable for intercourse. Seventeen (17.2%) failed treatment. There were no differences in the response rates between the various aetiological groups. A total of 33/99 (33.3%) men reported return of spontaneous erections suitable for penetrative intercourse, at least once, following treatment, of whom 14 (42.4%) did not have any spontaneous erections suitable for intercourse prior to therapy. Of the 74 men reviewed at Visit 4, 59 reported that they would continue using Viagra on a long-term basis (79.7%). Three men had reported complete return of spontaneous erections and had stopped using Viagra (1 at Visit 2 and 2 at Visit 4). this drugstore sells viagra without prescription canadian pharmacy viagra for sale About four percent -- 944 -- of the men reported symptoms of restless legs syndrome. These men had an average age of 70, while those without restless legs were on average about two years younger, tended to exercise more, and were less likely to smoke. ED: Make It a Time for Sexual Experimentation Are there physical causes of erectile dysfunction? A prior history of cigarette smoking, heart attacks, strokes, and poor circulation in the extremities suggest atherosclerosis as the cause of the erectile dysfunction. Diminished sensation of the penis and the testicles, bladder dysfunction, and decreased sweating in the lower extremities suggest diabetic nerve damage. Loss of sexual desire and drive, lack of sexual fantasies, gynecomastia (enlargement of breasts), and diminished facial hair suggest low testosterone levels. Have you been able to achieve and maintain erections in the past?