The Sex Organs - The Male Sex Organs

The Internal Sex Organs: Accessory Organs

The Bulbourethral Glands (Cowper's Glands)
Below the prostate gland, there are two small glands about pea size which during sexual excitement secrete a clear, alkaline fluid into the urethra. Often a small drop of this fluid can be seen at the opening of the penis well in advance of an actual ejaculation. It is not entirely impossible for the drop to contain some stray sperm cells. (This could account for the rare cases of pregnancy without ejaculation of semen).