Sexual dysfunction (SD) is a common health problem for many men and women all over the world. This study was conducted to determine sexual dysfunction among Turkish men and women with type 2 diabetes mellitus (DM). Eighty men and eighty women were included in the sampling. This study inclusion criterion were: awareness of the illness, literate, married, the age range of the diabetic women 18-45, and not pregnant, the age range of the diabetic men 18-65 years, DM diagnosed at least 1 year, able to read the Turkish language, agreed to participate in the study. The data was completed using a questionnaire form, the index of female sexual function (IFSF), and the international index of erectile function (IIEF). The prevalence of male sexual dysfunction was 65.0 %; the prevalence of female sexual dysfunction was 68.8 %. The scores obtained from the subscale of the IFSF were lower for women with SD. There were also significant differences between the two groups in all domains (lubrication, sexual desire, intercourse satisfaction, clitoral sensation, overall satisfaction) except for the orgasmic function domain (p = 0.000). Scores obtained from the subscale of the IIEF were lower in men with SD, and between the two groups significant differences were found in the domains of erectile function (p = 0.000) and sexual desire (p = 0.010). We also found statistically significant differences between the income level (p = 0.003), family size (p = 0.002), therapy (p = 0.017) and SD in women. Differences for men were found between the age and SD (p = 0.018).