The paired bulbourethral (Cowper's) glands are small, about the size of a pea, and located near the base of the penis. A short duct from each gland enters the proximal end of the penile urethra. In response to sexual stimulation, the bulbourethral glands secrete an alkaline mucus-like fluid. This fluid neutralizes the acidity of the urine residue in the urethra, helps to neutralize the acidity of the vagina, and provides some lubrication for the tip of the penis during intercourse.

Referrence:Bulbourethral Glands(Chinese Version)

Bulbourethral Glands Ronald A. Bergman, PhD Adel K. Afifi, MD, MS Ryosuke Miyauchi, MD Peer Review Status: Internally Peer Reviewed -------------------------------------------------------------------------------- In addition to abnormalities in size, the two glands may be fused into a single mass, or one or both may be absent. Sometimes their absence is questionable since the organs may be represented by rudimentary glands embedded entirely within the substance of the corpus cavernosum urethrae.