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Involuntary muscle contractions are caused by myotonia, which usually occurs during the orgasm stage of the sexual cycle. Increased muscle tension can occur throughout the body during sexual arousal, in the form of facial grimaces, spasmodic contractions of the hands and feet, and muscular spasms in the vagina, uterus, and anus during orgasm. Because your pelvic muscles contract during an orgasm, the pain could simply be from a muscle spasm. Orgasm (from greek 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. Many women experience rhythmic muscle spasms in the vagina during an orgasm. Several researchers have proposed that sexual response follows specific stages, though their theories about these. Vaginal contractions are contractions of the pelvic muscles surrounding the vagina, especially the pubococcygeus muscle. Vaginal contractions are generally an involuntary muscular response to sexual stimulation, including sexual arousal, and are commonly most intense during sexual stimulation and culminating in orgasm. Some women experience enormous muscle spasms during and after orgasm. According to the study of masters and johnson this is due to contraction of the vaginal muscles. This theory dates from the 1960s and is not 100 reliable anymore. the area of the brain which controls emotions like fear and anxiety, powers down during an orgasm as does the lateral orbitofrontal cortex, the part of the brain that controls our behavior. First, orgasm is a total body response, not just a pelvic event. Brain wave patterns have shown distinct changes during orgasm, and muscles in many different areas of the body contract during this phase of sexual response. Some people experience the involuntary contraction of facial muscles resulting in what looks like a grimace or an. orgasm without ejaculation is called dry orgasm, says winters. Its achieved by flexing the pc pubococygeus muscle during orgasm. involuntary muscle spasms duringafter orgasm? When im masturbating and i think im about to orgasm, for like 3 seconds it feels really good but then my butt muscles and vagina muscles start involuntarily contracting which ruins it. Durign the climax of sexual arosul (orgasm) the buttock, vaginal, and even uterin muscles will contract by.