Hi there I understand your concern.... There is no relationship between penis size and sperm production....Penile shortening is a phenomenon that is associated with certain medical and surgical conditions. These conditions include prostate cancer patients treated with radical prostatectomy, Peyronie's disease and congenital anomalies. There is also some evidence that erectile dysfunction may be an independent risk factor for shortening... Standard measuringtechniques are necessary to determine the results of penile lengthening procedures...consult urologist they will examine and explain you abo treatment modalities... regards.