Male genitalia two jobs, one discharge of urine, two are discharged semen. Two kinds of function consists of a valve control, either open the valve, so that the urine; either close the valve so that the semen is discharged. Normally, this exit is only responsible for the urine, there is no contradiction, but sexual arousal, if the urine within the bladder, which existed prior to the discharge issue. If forbearance urinary OK intercourse, filling of the bladder oppression around the genital organ congestion, easy to induce prostate disease. Therefore, the best sex before emptying stool and urine.