Male accessory glands (MAG) are the seminal vesicles, prostate gland, and the bulbourethral glands.[1][better source needed] These glands are found only in mammals.[2] In insects, male accessory glands produce products that mix with the sperm to protect and preserve them, including seminal fluid proteins.[3] Some insecticides can induce an increase in the protein content of the male accessory glands of certain types of insects. This has the unintended effect of increasing the number of offspring they produce.[4]
The accessory glands of male mammals secrete fluid for nourishment of sperm and sexual attraction.[2]