Typically refers to the most notable sign of male sexual arousal: the soft tissues of the penis fill with blood, causing the penis to grow substantially in size and become firmer. This allows the man to engage in intercourse and other sexual acts.

While erections are often associated with arousal, men can achieve erections without arousal, and aroused men may have trouble achieving erections for a variety of reasons. Some lubricant ingredients are included to help men create or sustain their erections (see “”erectile dysfunction”” for more information).

The female clitoris also fills with blood during arousal, which often causes the clitoris to protrude from the clitoral hood. While this is physiologically similar to a male erection, the term “”erection”” almost always refers to the penis.