The fact that both genders have nipples has nothing to do with speciation. A better question would be how does intelligent design explain molars and appendixes, though they are probably explainable in terms of natural selection: if a trait ceases to be a factor in the survival of the species, it will probably be retained as a vestigial trait.
Appendixes are now know to have an important function. They provide fluid into the colon which reduced the chances of getting colon cancer.
By molars, I assume you mean wisdom teeth. Wisdom teeth are most likely due to microevolution with the human species. Our jaw has gotten smaller over time, causing the medical problem known as wisdom teeth. However, I see no way that this can be presented as a positive evolution. Smaller jaws and wisdom teeth do not contribute to survival. It's a degradation, consistent with devolution, and a cursed earth, with a perfectly designed human body slowly being degradated over time.
There are now over 600 inherited human genetic diseases. Where are the positive mutations promised by evolution?