What is the tube that carries both sperm and urine for release outside the body?
In males, the urethra carries both sperm and urine outside of the body.
The urethra has sphincter muscles, which allow for urination to be a process that we can control. Sphincter muscles control the opening and closing of a tube (they are also present near the stomach!) All humans have an external urethral sphincter, but only males have an internal urethral sphincter.