Sometimes guys ejaculate at night while sleeping (these are called nocturnal emissions or wet dreams). Usually, an erection causes the penis to enlarge and stand away from the body.Įrections can go away on their own or after ejaculation, the release of semen through the urethra, the small hole at the tip of the penis. What Is an Erection?Īn erection is a hardening of the penis that occurs when sponge-like tissue inside the penis fills up with blood. Erections are a perfectly normal function of the male body, especially in guys who are going through puberty.
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