LAte to the party here, but here are some thoughts.
Is Pregnancy till the result of Sex? If two people both pray to the gods for a child, is the act of Sex still required?
Currently sex is by and large for most species (as near as I know) a pleasurable act (other than humans, Dolphins engage in sex without procreation, as does the Bonobo Monkey (http://en.wikipedia.org/wiki/Bonobo#...ocial_behavior)), and is made to be so to encourage reproduction.
So, that said, if pregnancy is only the result of the gods granting a wish,would their even be sex? Just a thought.