Multiple dramatic consequences follow medullary lesions. Not only are voluntary motor control and sensitivity of the body segment below the lesion lost, but it also becomes impossible to control erection and ejaculation as well as urinary and faecal continency. The first investigations into genito-sexual function in paraplegics have brought about the idea, commonly admitted in the medical world, that this kind of patient is impotent and sterile. Fortunately this idea is disappearing gradually and many data have demonstrated that appropriate treatment is required and some therapies efficient. This is particularly important in the case of the population concerned, namely young men in 70% of the cases, since the usual age bracket at trauma is between 25 and 35 years old. At this time of life, sexual activity is often at its peak, so that the fertility potential becomes erased.