How come urine does not come out when sperm is supposed to, and vice versa?
The male reproductive system and whoever created man must have thought “why have two, when you can have a little gadget inside to control it?” so they put in the Prostate Gland. The prostate gland is situated between the testes and the urinary tract and controls whether sperm or urine is released. The bladder is not connected to the testes in any way. Can you get pregnant from using the same toilet seat as a man? No you cannot. Sperm is not released when a man urinates and so it is perfectly OK to use it after them.