Introduction: Sex conversion in Iran, similar to any other countries around the world raises some socio-medical problems. In most countries, the process of sex change in gender studies has been less explored. This study aims to determine the correlation of social support and sexual function of men with gender identity disorder after sex reassignment surgery in Tehran, Iran. ‪
Methods: In this descriptive-correlation study, 85 transgendered men that admitted to Mirdamad Day Clinic in Tehran were selected through convenience sampling. Data was collected by demographic questionnaires, and “Female Sexual Function”. Multidimensional Scale of Perceived Social Support" Validity and reliability were assessed by 10 experts and data was analyzed using SPSS version 17.‬‬‬ ‪
Results: The overall prevalence of sexual dysfunction was 84%. The highest frequency was related to scope of pain (77%) and the scope of orgasms (53%). Further, 51.8% of the patients had lower social support. The mean of family support had the highest value (53.3%) among scopes.‬‬‬ 
Conclusions: This study showed that gender identity disorders had low social support and sexual functionality after surgery. Therefore, patients should be advised of the possible sexual dysfunction consequences before the surgeries.