El orgasmo (del idioma griego ὀργασμός) o clímax (del griego κλίμαξ, «escalera» o «subida») es la descarga repentina de la tensión sexual acumulada, durante el ciclo de la respuesta sexual, resultando en contracciones musculares rítmicas en la región pélvica caracterizadas por el placer sexual. Experimentados por los machos y las hembras, los orgasmos son controlados por el sistema nervioso involuntario o autónomo. A menudo se asocian con otras acciones involuntarias, incluyendo espasmos musculares en múltiples áreas del cuerpo, una sensación de euforia en general y, frecuentemente, se exteriorizan movimientos del cuerpo y vocalizaciones. El período después del orgasmo (conocido como periodo refractario) es a menudo una experiencia relajante, atribuido a la liberación de las neurohormonas oxitocina y la prolactina, así como las endorfinas (o "morfina endógena"). Los orgasmos humanos generalmente resultan de la estimulación sexual física del pene en los hombres (típicamente acompañando a la eyaculación), y del clítoris en las mujeres. La estimulación sexual puede ser por práctica propia (masturbación) o con una pareja sexual (relaciones sexuales con penetración, relaciones sexuales sin penetración, u otra actividad sexual erótica). El orgasmo en los animales se ha estudiado significativamente menos que el orgasmo en los seres humanos, pero se continúa investigando el tema.

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Orgasm (from Greek ὀργασμός orgasmos "excitement, swelling"; also sexual climax) is the sudden discharge of accumulated sexual excitement during the sexual response cycle, resulting in rhythmic muscular contractions in the pelvic region characterized by sexual pleasure. Experienced by males and females, orgasms are controlled by the involuntary or autonomic nervous system. They are often associated with other involuntary actions, including muscular spasms in multiple areas of the body, a general euphoric sensation and, frequently, body movements and vocalizations. The period after orgasm (known as the refractory period) is often a relaxing experience, attributed to the release of the neurohormones oxytocin and prolactin as well as endorphins (or "endogenous morphine"). Human orgasms usually result from physical sexual stimulation of the penis in males (typically accompanying ejaculation), and the clitoris in females. Sexual stimulation can be by self-practice (masturbation) or with a sex partner (penetrative sex, non-penetrative sex, or other sexual activity). 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. There is also a wide range of sexual dysfunctions, such as anorgasmia. These effects impact cultural views of orgasm, such as the beliefs that orgasm and the frequency/consistency of it are important or irrelevant for satisfaction in a sexual relationship, and theories about the biological and evolutionary functions of orgasm. Orgasm in non-human animals has been studied significantly less than orgasm in humans, but research on the subject is ongoing.

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