在前列腺的下方，有两个如豌豆大小的腺体，既尿道球腺。它们在性兴奋期会分泌清亮的、呈缄性的液体入尿道。通常在射精前从阴茎头的开口能够见到这种小液珠。小液珠里含有一些游离的精子是完全可能的。（这能够解释没有射精也怀上了孕的罕见事例）。

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).