pre-seminal

thumb|Pre-ejaculate on the Glans penis|glans of the penis

Pre-ejaculate (also known as pre-ejaculatory fluid, pre-seminal fluid or '''Cowper's fluid, and colloquially as pre-cum''') is a clear, colorless, viscous fluid that is emitted from the urethra of the penis during sexual arousal and in general during sexual activity. It is similar in composition to semen but has distinct chemical differences. The presence of sperm in the fluid varies from low to absent. Pre-ejaculate functions as a natural lubricant and an acid neutralizer.