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Erections
 An erection is when blood rushes into and fills the penis, causing it to enlarge and stiffen. The purpose of erections is to facilitate sex, but in many men and boys, they happen much more often than that.
Erections are a reflex--meaning not within a person's control--so you can't always identify the cause. (It could be anything from a brush of fabric to the need to urinate.) But they most often occur as a response to sexual thoughts or stimulation.
Erections are also known as boners, hard-ons, woodies and stiffies, to name a few slang terms.
Erections happen a lot during sleep (which can lead to so-called wet dreams, when boys ejaculate excess sperm). Teenage boys often wake up with erections.
Sometimes erections happen quickly, sometimes not, but the process is generally the same: In addition to stiffening, the penis can get darker in color and the head can grow bigger. The testicles (balls) draw in close to the body, instead of hanging loosely.
During an erection, the penis often produces a small amount of clear fluid, called pre-ejaculate (or "pre-cum"), which can contain sperm and therefore can cause pregnancy if the fluid gets inside a woman's vagina (even just at the opening).
Erections disappear in one of two ways: either by themselves as the muscles simply relax, or after ejaculation.
Boys and men are often frustrated by not being able to get, keep or get rid of erections when they want to. Performance anxiety and other psychological issues can aggravate the problem.
When girls and women get sexually aroused, blood flows to their genitals as well. This is known as engorgement.
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