Sperm causes contractions
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It's The Hormones
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Description:Having an orgasm may help to stimulate your womb (uterus) into action. Having sex can trigger the release of oxytocin, a hormone that helps your contractions. Semen may help to soften, or ripen, the neck of your womb (cervix), ready for it to open when labour starts. Semen contains a high number of prostaglandins, which.