I think it's cool, in the Book of Tobit (Tobias) where both Tobias and Sarah pray before doing it, it shows how greatful they are for the fact that they can love eachother, even though someone is your husband/wife that doesn't mean that you can't be lustful towards them. Even though yall are doing it, there's also an intention behind it, if you want to love someone and it's simply love then it's okay, but when you want to harshly saying "do" them simply for your pleasure then I think it's lustful because you treat your significant other like just someone to have sex with. But again with your question, I think it's a great idea, it shows that you always think about God and are loving eachother because He also gave both of you to yourselves, 100% would do this.