Our bodies now die and they respond to the laws of survival. The urge to reproduce is powerful but simply doesn't exist for a body that isn't going to die.
Terrible rationalization.
if it were just that, then people post menopause wouldn't desire, or enjoy sex.
women on birth control wouldn't have sex
women who were sterile, wouldn't have sex
men who were sterile or had a vasectomy, wouldn't have sex
yet it remains something desirable even when it has nothing to do with procreation.
Because there's intimacy, and bonding, and emotions involved (and mind you I'm only talking about within a married couple, when it's something good that God designed)
Why do people in hookup culture/one night stands or involved with prostitution find ultimately no fulfillment in the act?
Because because it's missing what God intended for it to be, and it's not just procreation as prostitutes and one night stands can procreate.
It's missing the love and bonding and actual intimacy.
That's a person's actual desire. Not just for physical pleasure
and not just to procreate.
I think I'll illustrate with another thing as well.
In the eternal state in new bodies that do not die, we will not need to eat right?
Yet Jesus often used eating in describing what heaven will be like, a banquet, the wedding supper of the lamb, Revelation 3:20 is an example too. Eating together, is an act of fellowship, and even if we no longer need nourishment to sustain our bodies, we will enjoy eating and drinking because it is an act that provides pleasure in the taste and smells, and textures and appearance of food and drink, and the company and conversation that naturally accompanies a meal. God made a covenant with Earth after the flood... because He enjoyed the sweet savor of the sacrifice that Noah made (Genesis 8:20-21). Sometimes I do wonder if God really intends to make us all vegans.. cause He sure seemed to enjoy meat Himself..
But that's beside the point.
Survival is not the only reason we enjoy doing certain things and some of those things at least, we'll continue to do in eternity even though they no longer have a survival purpose. Eating and drinking is one example that is prominent.