Phallic sheath/Legends

A phallic sheath was a pouch of skin secreting the sexual organ of species such as the Wookiees of Kashyyyk, the Toydarians, and the Drall.

Description
The phallic sheath protected the male penis. Among Wookiees, the phallic sheath was a leathery pouch of roughly-textured flesh in the male's groin, forming a bulge beneath the fur. When aroused, the penis slowly emerged from its sheath to grow fully erect. Toydarians also possessed phallic sheaths as a bulging sac underneath the belly, and the Drall had tiny, ten-centimeter penises within their phallic sheaths.

Animals such as the massiff had protective, scaly phallic sheaths. Skarg possessed a huge, red penis within his sheath.

Behind the scenes
The phallic sheath was introduced in Shabby Blue's 2005 Legends erotic fiction "Chewie's Reward". Although unseen in the story itself, Kooriv confirmed that Zaalbar possessed a phallic sheath in his 2005 story "Big Z", as one of a number of minor retcons and expansions after the story's release. While discussing his 2013 story "Cavegirls of Dantooine", author VandalFlux suggested that Loana could make her lightsaber hilt from the bone phallic sheath of a graul mauler.