Aim — sexuality of 26—36-year-old type 1 diabetes mellitus patients (T1D) was compared with published results of sexuality of healthy men from general population (HM) and sexuality of European Male Ageing Study (EMAS) different age more than 40-year-old men, assessed using EMAS- Sexual Functioning Questionnaire (SFQ). Material and methods. EMAS-SFQ was answered by 122 T1D patients with different duration of disease. Results were presented as scores of sexuality domains and ratio of percent of specific sexual parameter of Lithuanian HM or T1D divided to percent of different age of EMAS or different cities investigated in EMAS. Results of HM of 26—36-year-old were comparable with these of EMAS 40—49-year-old men, and results of T1D of 26—36-year-old were similar with these of EMAS 50—59-year-old men. Results. Masturbation (M) score of HM was statistically higher than in T1D males (p<0.05). This increase was independent of duration of T1D, but was due to lower number of men who never masturbate (lower number of 0 points in calculating the M score). Comparison of M score between HM and T1D who ever masturbated did not reveal statistically significant result. M did not differ significantly between the groups of males with regular, non-regular sexual partner and without partner at all (p=0.811). The same result appears when T1D and HM groups are analysed separately. When the M of T1D males are compared with HM statistically significant difference of M (p<0.01) was observed from the first 0—5 years of the disease.When males having regular or non-regular sex partner were compared with the ones without partner at all in the groups of HM, T1D males and the group of all participants, statistically significant differences of M was observed only in T1D male group (p=0.048) but not in the groups of healthy males (p=0.773) or all participants (p=0.160). Sexual functioning distress was higher in T1D in all the groups of the duration of disease, including 0—9-year-duration of diabetes, in comparison with HM and EMAS 40—70 +. Negative changes of sexual functioning were statistically significant only than comparing the whole group of T1D and HM, but differed significantly comparative with EMAS 50—70+ men. Used as single item of erectile dysfunction is also useful and is highly discriminative in most cases. Low incidence of erectile dysfunction is evident in comparison of HM with all the other groups of investigated men. Conclusions. Use of multidomain sexual function questionnaire EMAS-SFQ proved to be useful for sexuality investigation of the males of different ages. Multiple domains have its own prerogatives, but use of single items (masturbation and erection) may be equally important. Since healthy men sexuality of 26—36-years is comparable with EMAS 40—49-year-old men, and 26—36-year-old T1D is similar to EMAS 50—59-year-old men, «plateau» of HM during 20—60 years is expected and decreased sexuality early in 40 years may be a sign of aging in males.