在前列腺的下方，有兩個如豌豆大小的腺體，既尿道球腺。它們在性興奮期會分泌清亮的、呈緘性的液體入尿道。通常在射精前從陰莖頭的開口能夠見到這種小液珠。小液珠裏含有一些游離的精子是完全可能的。（這能夠解釋沒有射精也懷上了孕的罕見事例）。

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).