The explosion of seminal fluid backward into the bladder instead of forward through the urethra. Or millions per ejaculate. Sperm can be alive yet not move. Testicular torsion - A condition in which the testicle twists on itself, cutting off its own blood supply. It occurs most commonly in adolescents.
Surgical correction is necessary as soon as possible to save the testicle.
It is associated with excrutiating testicular pain. Varicocele - A collection of vericose veins in the scrotum. Blood flows in an abnormal direction in these veins towards the testicle rather than the normal direction which is always towards the heart. It is used to determine whether a blockage exists. Viscosity - The thickness of the semen.