Study aim: Effectiveness of biofeedback for sexual function in women with vaginismus Design: It is a clinical trial with a control group, with parallel groups, double-blind and randomized. Statistical software will be used for randomization. With significance level of 5% and a test power of 80%, a sample size of 28 cases (2 groups of 14) was obtained. With the 10% chance of dropping samples, the final sample size was determined to be 32 (2 groups of 16). Settings and conduct: After obtaining ethics approval and registering the study protocol in the Iranian Clinical Trials Registration System, eligible people are invited to attend the physiotherapy clinic of Isfahan Faculty of Rehabilitation Sciences. If desired, the person enters the study. The persons performing the assessments and statistical analysis are unaware of the patient grouping. Participants/Inclusion and exclusion criteria: Inclusion criteria: Married women (18-45 years) who have not yet succeeded in intercourse, Primary vaginismus grade 2 to 4. Exclusion criteria: Pregnancy, Secondary vaginismus, Hymen structural disorders, Vulvodynia, Infection, Menopause, Pelvic pathology, Psychological diseases, Spouse's sexual disorders, History of urogenital surgeries Intervention groups: Patients receive general education about their sexual organs. The physiotherapist teaches the person how to use the dilator with the lubricating gel. In the control group, the patient inserts the dilator into the vagina and holds it for 10 minutes. Then, the physiotherapist inserts the dilator. The dilators used include six standard sizes that increase in size progressively. The intervention group will also receive biofeedback in addition to the dilator. All patients are treated for six weeks, twice a week, every other day. Main outcome variables: Female Sexual Function