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In page Progesterone:

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Progesterone plays a role in early human sexual differentiation.[1] Placental progesterone is the feedstock for the 5α-dihydrotestosterone (DHT) produced via the backdoor pathway found operating in multiple non-gonadal tissues of the fetus,[2] whereas deficiencies in this pathway lead to undervirilization of the male fetus, resulting in incomplete development of the male genitalia.[3][4] DHT is a potent androgen that is responsible for the development of male genitalia, including the penis and scrotum.[citation needed]