Hair on the penile shaft, also known as pubic hair, is a secondary sexual characteristic found in both males and females. It is a type of coarse hair that grows in the pubic region and can extend down the inner thighs.
Pubic hair serves several important functions, including protecting the genitals from friction and irritation, regulating temperature, and enhancing sexual arousal. Historically, the presence of pubic hair has been associated with fertility and maturity.