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. The term erection is most often used to refer to an erection of the penis. An erection (pronounced ee- REK-shən) of a body part such as a man's penis, a woman's clitoris or a nipple refers to it becoming larger and harder.
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