Master in Sexology and Psychosexual Counseling. For More Info WhatsApp- 9604715783/9359863878. Men: Orgasm occurs in two distinct stages. In the first stage the Vas deferens, the prostate and Seminal vesicles begin a series of contractions that forces semen into the bulb of the urethra. The man experiences a sensation of Ejaculatory inevitability’-the feeling of having reached brink of control.