Human sperm contains a high amount of prostaglandin, a hormone‐like substance which ripens the cervix and helps labour to start Sometimes it is necessary to help start labour and it has been suggested that sexual intercourse may be an effective means. Sex is safe for most people at this point in their pregnancy who are hoping for a vaginal delivery, so while the research showed it didn’t really help, it would be safe to try. While arousal can trigger the release of oxytocin (the hormone that stimulates contractions), the emotional connection and comfort level during sex may influence its potential to induce labour. However, there is no scientific evidence to support the idea that any particular sex position can induce labor Hormonal changes in the body are what bring on labor, so the sex position doesn’t really matter.
Having sex can trigger the release of oxytocin, a hormone that controls your contractions Semen may help to ripen, or soften, the neck of your uterus (cervix) ready for it to dilate when labour starts.
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