Thomas Aquinas, Compendium of Theology

Although risen men will not occupy themselves with activities of this sort, they will not lack the organs requisite for such functions. Without the organs in question the risen body would not be complete. But it is fitting that nature should be completely restored at the renovation of risen man, for such renovation will be accomplished directly by God, whose works are perfect. Therefore all the members of the body will have their place in the risen, for the preservation of nature in its entirety rather than for the exercise of their normal functions.

Moreover, as we shall bring out later, men will receive punishment or reward in that future state for the acts they perform now. This being the case, it is no more than right that men should keep the organs with which they served the reign of sin or of justice during the present life, so that they may be punished or rewarded in the members they employed for sin or for merit.