Cowper's glands

Perhaps it was in 1931, when Abraham Stone—a physician and colleague of Planned Parenthood founder Margaret Sanger—wondered how it was even possible for the withdrawal method to fail: Sperm are made in the testicles and don’t route through the Cowper’s glands on their way out.

She explained the term and then invited me to identify the Cowper’s glands on a diagram of the male genitalia.

The accessory generative glands are the two vesiculae seminales, with the median third vesicle, or uterus masculinus, lying between them, the single bilobed prostate, and a pair of globular Cowper’s glands.

He subsequently published a variety of papers on surgery, and was the discoverer of Cowper's glands.

Vesiculae seminales are never developed, but Cowper’s glands may be present or absent.