darn keyboard. sperm doesn't put you into labour. but it does soften and rippen your cervix.****
orgasms can cause your uturus to contract but wont induce labour unless like mentioned already if your already in inactive labour it can help make the contractions more effective. and sperm doesn't put you into labour either but its a great idea to have as much sex as possible because the sperm doesn't soften and rippen your cervix so again once your in labour you will progress faster. it also helps you produce more vaginal discharge again helpful in preparing the vagina for delivery.
With my 1st me and my bf had sex, after I had orgasamed I had a stitch like feeling down one side of my stomach never went away and just got worse. I was I labour. It's the man's sperm that can start labour off as it thins the lining of the womb x
Orgasm can cause a contraction but will not induce labor. It can help progress an inactive labor to active.