English: This male has had a tendency of his testicles to slip or retract into the inguinal canals since childhood. This usually happens in cold temperatures or during strong sexual arousal when the scrotum tightens. In this image the male (standing) is revealing his genitals during obvious sexual arousal with strong erection and retracted testicles (the testicles can be seen as bulges on both sides of the empty scrotum). In addition to the sexual arousal the male was greatly excited of exposing his sexually aroused genitals in front of the camera, this may have increased the possibility of his testicles to retract. This male finds testicular retraction slightly unpleasant but it's not harmful. Occasional testicular retraction is not uncommon.