
An erection will usually not be possible immediately following ejaculation, although adolescent males may be able to achieve erections immediately following ejaculation. A man's erection usually stops if he is no longer sexually aroused, or after he has had an orgasm and has ejaculated. Tissues in the penis called the corpus spongiosum penis and corpora cavernosa penis fill with blood, causing the penis to become longer, thicker, harder and to stand upright. This happens to all healthy adult males of all ages. Erections happen several times during the night. Most boy teenagers have unexpected erections. Erections can also occur without thinking about sex or being touched. This can happen if he is touched sexually, or even if he is not touched – for example, if he sees a naked person or thinks about having sex with someone else. In a healthy male, an erection will usually occur if the man is sexually aroused (made sexually excited) or stimulated. It is widely believed that a man's penis needs to be erect in order for him to take part in sexual intercourse and penetrate his partner's vagina and to ejaculate semen, but all are possible without an erection. It is also normal for male teenagers and men to have an erection several times per night when sleeping. It is normal for the penis to be erect when a male wakes up. Erections sometimes occur in the male fetus (the body before birth), and occur naturally in boys from birth onwards. The Simple English Wiktionary has a definition for:Īn erection (pronounced ee- REK-shən) most often refers to an erection of the penis.
