QUOTE=AlanFromWichita]The Church cannot be saying that this is an absolute rule for each and every act of marital sex. For example, aren’t couples who know they are sterile (for example because of hysterectomy due to cancer) still allowed to marry and have marital relations? They unfortunately cannot bring children into the world, but that does not prevent them from continuing to have marital relations for the secondary purpose of the act.
There is one small problem I have, though. Perhaps for the human race the primary purpose is reproduction and the secondary purpose is unitive. For any given individual, though, the sexual urge seems to be designed to drive the human flesh toward the unitive purpose, completely unaware and unconcerned with the reproductive purpose. To deny this urge, then, is a form of fasting. Giving in to this urge using ABC would seem to be like drinking diet soft drinks which have artificial sweetener and flavor but no nourishment. Whether with sex or with oral gratification of diet soft drink, one could be saying they are “lying” to themselves, but is it sinful? What makes it sinful? Is it that is enjoyable? Would it be sinful to drink a diet soda only on the condition that you don’t know it is diet – or there may be a chance that it isn’t?