I think most of the things are not scientifically proven - the only two I know that is based on science is the playing of breasts and nipples - as this mimics breastfeeding and causes uterine contractions and sex - as semen contains ingredients that are found in labour inducing medications!
Semen helps to ripen the cervix. When the women reaches orgasm during love making, her body produces oxytocin which stimulates surges or waves. All natural inducement methods prepares the body for labour. Only when her body is ready then will it works.
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