"On the other hand, male-female couples that, due to age, a medical condition, or even the woman’s natural cycle, CANNOT conceive a child do ENGAGE in a PROCREATIVE ACT. The genital union that they achieve is the kind of activity that nature ordains to produce children. And IF NOT for age, or the accidental physical defect, or the natural time of the woman’s cycle, the natural end of procreation would be achieved. So, the inability of a male-female couple to generate children in their sexual act, where the INABILITY is NONVOLUNTARY involves an impeded natural ability; whereas a SAME-SEX couple’s INABILITY to generate children in their sexual activity INVOLVES NO NATURAL ABILITY."
Catholic.com. No me. Not my church. YOURS.