sperm ejaculation ejaculation proper E1.0.0.0.0.0.12 The second stage of ejaculation during which orgasm occurs and the bulbospongiosus muscle squeezes strongly continuously, forcing semen to move from the ejaculatory ducts into the urethra. Following this, semen is pushed along the urethra until it shoots out of the end of the penis in spurts. expulsion phase of ejaculation