Valkenburg (population: 3,760) is a village in the western Netherlands, in the province of South Holland. The municipality covers an area of 5.74 km² (of which 0.23 km² water).
... for sperm.
The external urethral sphincter is the skeletal muscle that allows voluntary control over urination.
In the human female, the urethra is about 1-1.5 ...