Hi DiannaQ

Yes your orgasm can bring on labour also there is a hormone in sperm that can also bring on labour.
In fact havibd sex is one of the reccomendations I make to women who are past their dates and are worried about being induced.

However after saying that it is very unlikely but not impossable that it will bring on labout at 36 weeks. So I say enjoy it while you can, you are going to be very tired after the baby is born