No b by force. I had sex till d day bfr, I still an epi. Its d sperm dt helps with dilation. It contains prostaglandins that simulate pitocin which they use in augumenting. That is to say that... if u hv sex more close to ur dur date and ur hubby ejaculates inside, yes, ur labour might be fast. It doesn't make d opening wider biko. A woman's anatomy has d ability to stretch wide enough to accomodate a baby's head. If its not enough, they gv u a slight cut callled an episiotomy