A total of 164 males aged from 22 to 50, who had taken part in liquidating the consequences of Chernobyl power station accident, was examined. According to the military cards irradiation dose did not exceed 25 cGy. Semen of 125 examinees was studied. One third of examinees showed sexual dysfunction, which did not appear to depend on the irradiation dose. Analyses revealed pathologic changes in semen and ultrasound demonstrated alterations in prostate and seminal vesicles similar to chronic prostatitis and vesiculitis. No typical radiation-induced lesions were discovered. The author suggest assigning infertility and impotence to the list of entitles, which occurred and exacerbated due to liquidating the consequences of Chernobyl power station accident.