[armydoc]

In this context, "procreative sex" means sex that is the way people normally procreate. You use your sex organ too put semen in your wife's genital tract.

My understanding that a "procreative intent" is also required, not just a "procreative form". If only "form" counts, then intercourse in the presence of artificial BC or when the woman has had a tubal ligation is "procreative" as well.

[SuziQ]

My understanding that a "procreative intent" is also required

I don't know where you learned that, but it's clearly wrong. Even John Paul II taught about the unitive aspects of sexual relations in marriage. Sometimes they're procreative as well, but they won't always be. You don't have to limit the sexual act in marriage to only those times you wish to conceive children. THAT would thwart the unitive aspects of marriage that God planned when he said "the two shall become one."