Involuntary spasm of the muscles around the vagina, usually caused by anxiety, can result in vaginismus. Near the perceived start of orgasm, a series of regular contractions began in 9 of the women, with anal and vaginal contractions synchronizing with each other. Vaginal contractions should not be confused with uterine contractions. Additionally, when the woman is fertile, sperm is only transported to the side of the dominant ovary. Vaginal contractions are caused by both the activity of certain brain regions and the release of the hormone oxytocin. Though usually an involuntary response, some women can control the muscles of the vagina to perform vaginal contractions at will. Involuntary vaginal contractions may arise from non-sexual causes. Archives of Sexual Behavior. 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.
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