Climax is a term for the peak of sexual excitement. During climax, a person experiences involuntary muscle spasms accompanied with feelings of euphoria and pleasure. Climax may occur during masturbation, foreplay, or sexual activity.
When it’s used as a noun, climax is a synonym for orgasm. As a verb, the term climax describes the process of achieving an orgasm. Come, or cum, is another common synonym for the term climax.