The development of a penile erection, also demonstrating the foreskin steadily retracting about the glans. See also: Commons graphic gallery. The human penis differs from those of most other mammals, as it's no baculum (or erectile bone) and instead relies entirely on engorgement with blood to achieve its erect condition. https://ananya-lipe27047.blogthisbiz.com/42447555/facts-about-services-revealed