The length of time a man is able to maintain an erection is an important facet of his normal sexual functioning. Most young men can maintain a firm erection for at least 5 - 15 minutes, and some individuals for more than half an hour. On average, after penetration, most men can sustain their erection for about 8 - 10 minutes before ejaculation. The number of orgasms experienced successively during intercourse also varies from man to man. Most are satisfied with one orgasm per sexual encounter, but others need several for total satisfaction. Medically speaking, and in the absence of any sexual dysfunction, all of these men are so-called normal.
After orgasm and ejaculation, or when erotic physical and psychological stimulation ceases, the penile arteries and sinuses narrow to their normal diameter, the veins are decompressed, and the unimpeded outflow of blood from the penis leads to the loss of the erection and the return of flaccidity.