any functional anomaly of the small paired racemose (compound tubulo-alveolar) glands below the apex of the prostate in males, located posterolateral to the membranous portion of the urethra at the base of the penis, which produce a clear, salty, viscous secretion known as pre-ejaculate (aka as pre-ejaculatory fluid, preseminal fluid, or Cowper's fluid) upon sexual stimulation; this fluid is believed to lubricate the urethra for spermatozoa to pass through and neutralize traces of acidic urine in the urethra