Something had me puzzled last night about this. First how is having sex gonna help you go into labor unless your truly ready. A. If you have sex the entire time you are pregnant and his sperm does not affect it than, why would it now. B. Playing with your nipples to produce oxytocin, he may do that the entire time as well and don't put you in labor, so again why would it now? My point it is nice to be able to have sex till you deliver, but if the baby is ready it is ready regardless whether you have sex or you don't. Don't take it the wrong way, I just could not understand how that will make you go into labor. Ok after typing that I seen Mikayla respond. Very true what she said. If you are dialating to soon or anything than like she said no sex. The sperm could cause an infection. But you should be fine if your not dialating or having any problems.