Electric Fetus, we object to your comparison of breast feeding and urination because they're not even vaguely analogous.
One involves discharging bodily waste (there, your favourite word, discharge.) from an orifice that is solely there for getting rid of waste products.
One involves a) exposing your upper body, which is hardly a filthy or obscene thing. Sure, breasts are seen in the western world as overtly sexual parts, but a nipple is hardly comparable to an urethral hole. And b) giving a child some nutrition.
Saying they are alike is like saying that Mother Theresa and Adolf Hitler are alike because both breathed air, shat, and pissed. (There, I mentioned shitting and pissing, get your attention?)