The prostate is beneath the bladder and in front of the rectum. It’s a walnut-shaped gland that surrounds part of the urethra. (That’s the tube that carries pee and semen out of the penis). Here’s what it does:
If it gets too big, your prostate can block semen or pee from passing through the urethra and out the penis.
It produces fluid for semen, which includes sperm produced in the testicles.
It prevents urine from being included during ejaculation.