“Is having sex with your already-pregnant wife “non-creative” sex?”
As I understand it, any sex just for the fun of it (even in marriage) is a sin punishable by eternity in purgatory....or narnia or some other made up fairy tale land. The only sex that is allowable is sex for procreation, and even then, you better not enjoy it!
(sarc)
Sex is a very powerful and important thing.
Viewing it as simply a form of recreation is, first of all, denying reality. Secondly, it's not very smart.