To assess the magnitude of primary infertility and to study its etiologic aspects in India. After proper randomization, 10,063 married couples were interviewed to ascertain the prevalence of primary infertility. A definitive protocol was followed to determine the etiology of primary infertility in 250 consecutive couples. Tertiary care medical center in the Kashmir valley of India. Couples married for > or = 1 year; 250 consecutive couples attending an endocrine clinic for primary infertility. A logical investigative protocol was followed to identify the etiology of infertility. Magnitude of primary infertility in the community as well as the male, female, or combined etiology of infertility. Fifteen percent of the couples interviewed had primary infertility, among whom 4.66% had unresolved infertility at the time of the survey. The etiology of infertility in 250 consecutive couples revealed a female factor in 57.6%, a male factor in 22.4%, combined factors in 5.2%, and an undetermined cause in 14.8%. Primary infertility is as common and distressing a problem in India as in other parts of the world. Semen abnormalities (22.4%), anovulation (17.2%), ovarian failure (8.8%), hyperprolactinemia (8.4%) and tubal disease (7.2%) are common causes of infertility. The pattern of infertility in India is the same as in other parts of the world, except that infertile couples report late for evaluation.