Orgasm (from Greekὀργασμός, orgasmos; "excitement, swelling") or sexual climax (or simply climax) is the sudden discharge of accumulated sexual excitement during the sexual response cycle, resulting in rhythmic, involuntary muscular contractions in the pelvic region characterized by sexual pleasure.[1][2] Experienced by males and females, orgasms are controlled by the involuntary or autonomic nervous system. They are usually associated with involuntary actions, including muscular spasms in multiple areas of the body, a general euphoric sensation, and, frequently, body movements and vocalizations.[2] The period after orgasm (known as the resolution phase) is typically a relaxing experience, attributed to the release of the neurohormonesoxytocin and prolactin as well as endorphins (or "endogenous morphine").[3]
The health effects surrounding the human orgasm are diverse. There are many physiological responses during sexual activity, including a relaxed state created by prolactin, as well as changes in the central nervous system such as a temporary decrease in the metabolic activity of large parts of the cerebral cortex while there is no change or increased metabolic activity in the limbic (i.e., "bordering") areas of the brain.[7] There are also a wide range of sexual dysfunctions, such as anorgasmia. These effects affect cultural views of orgasm, such as the beliefs that orgasm and the frequency or consistency of it are either important or irrelevant for satisfaction in a sexual relationship,[8] and theories about the biological and evolutionary functions of orgasm.[9][10]