pre-ejaculate; Cowper's fluid; pre-cum
Medical and anatomical term for the clear fluid secreted by the bulbourethral glands before ejaculation. The gloss 'pre-cum' is vulgar slang; the other glosses are clinical.
Pre-ejaculate serves to lubricate the urethra before ejaculation.
The amount of Cowper's fluid secreted varies from person to person.