You may notice mild contractions during and after sex, but they are not powerful enough to start labour if your body is not ready. If it is ready, sex may help to start labour - substances called prostaglandins are contained in semen and can help to soften the cervix, and hormones released by nipple stimulation encourage the womb to contract.
Many couples find that pregnancy improves their sex life and presents an opportunity to find new ways of making love, by trying different positions to find one that's comfortable.
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