I think your problem in this discussion is that you believe the ELITES behave in a certain manner according to all sorts of details of religious belief (which they certainly don't) and that peasants simply don't count (but they do).
http://www.understandingyourancestors.com/ar/parishBirth.aspx provides a taste of what folks who indulge in the practice of GENEALOGY encounter all the time ~ the red-headed step chilluns and the baby with no baby-daddy ~ PLUS ~ delayed marriage.
That piece is about Germany. You try rural Russia back in the 18th century and it's a whole 'nuther story.
To show equitible treatment of the topic here's France http://www.jstor.org/pss/3787470
I'm not sure what you want to believe about our ancestors ~
The presence of illegitimate children or the practice of premarital sex does not establish your argument of a cultural standard that a man slept with a woman for the purpose of determining her fertility before marriage. That is the claim which you have, so far, failed to establish.
Since you have stated that there is a “record of this sort of behavior”, I’m sure that the appropriate primary source(s) will soon be forthcoming.
Perhaps instead of assigning beliefs to other posters, you should back up your own beliefs with evidence, not assertions.