Precum refers to a viscous liquid that oozes from the opening at the tip of a man's penis when he is sexually aroused. It is a clear, generally odorless and tasteless liquid that is released by the Cowper's glands. When a man is HIV-positive, pre-cum sometimes has the virus in it. Sometimes spelled pre-cum.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

The clear fluid that comes out of the penis during foreplay. To make sex more comfortable. Sort of lubricant

A clear, slightly gooey fluid produced by the bulbourethral glands (namely the cowpers gland) in human males. The fluid serves to lubricate and de-acidify the urethra for the impending deluge of semen. Also serves to remove any "foreign matter" from the urethra. Can carry residual sperm from recent ejaculations.

Precum is the fluid which is released from the tiny hole in the tip of a man's penis during sexual stimulation. Functions as a lubricant for the urethra.
Contrary to popular belief, it can in deed make some one pregnant even of just the tip near outside of vaginal entry!

The clear viscous fluid that is expelled through the penis when aroused provide lubrication

Pre-cum refers to a viscous liquid that oozes from the opening at the tip of a man's penis when he is sexually aroused. It is a clear, generally odorless and tasteless liquid that is released by the Cowper's glands. When a man is HIV-positive, pre-cum sometimes has the virus in it. Sometimes spelled precum.