Assertion: The bulbourethral gland is a male accessory gland.
Reason:: Its secretion helps in the lubrication of the penis, thereby facilitating reproduction.

Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A.

Bulbourethral gland, also called Cowper"s Gland, either of two pea-shaped glands in the male are located beneath the prostate gland at the beginning of the internal portion of the penis. These are responsible for adding fluids to semen during the process of ejaculation, thereby facilitating the process of reproduction.