Anatomy and Function
The urinary bladder is the organ that collects urine excreted by the kidneys which filter the blood. Urine enters the bladder via the ureters and exits via the urethra when urinating. [1] [2]

A hollow muscular, and distensible organ, the bladder can hold a volume of 1500mL, however, most people have the desire to void the bladder containing 200mL. Urination (micturition) is controlled by complex muscle fibers which can be trained in order to avoid incontinence. [1] [2]

Diseases
Due to the shortness of the urethra (approx. 3 cm), women often suffer cystitis. Since germs, like E. coli, often get into the urethra during intercourse, it's called honeymoon cystitis. It causes extremely unpleasant symptoms which include frequent urination, the urge to urinate or a painful burning sensation when urinating. In such cases, an increased liquid intake and heat can be helpful. In order to prevent urinary tract infections, consistent hygiene after intercourse is recommendable, for example, urination after sex helps to flush out possible germs. In severe cases, an infection can rise up and cause an inflammation in the kidneys, also known as pyelonephritis. Symptoms include blood in the urine, flank pain and fever. [3] [4]