Pre-ejaculate

clear organic fluid produced by male humans during sexual arousal

Pre-ejaculate (also known as pre-ejaculatory fluid, pre-seminal fluid or Cowper's fluid, and pre-cum) is a clear, colorless, fluid that comes from a penis when a man feels sexual arousal. Pre-ejaculate functions as a lubricant.[1]

Pre-ejaculate on the glans of a penis
Pre-ejaculate fluid dropping from penis
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References

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  1. Chudnovsky, A.; Niederberger, C.S. (2007). "Copious Pre-Ejaculation: Small Glands--Major Headaches". Journal of Andrology. 28 (3): 374–5. doi:10.2164/jandrol.107.002576. PMID 17251594.