I'm not pro-choice, I'm pro life but I think I may be able to answer your question in a simple manner, not in light of Religeon(I am a christian though), but more of common sense.
Right and wrong is determined by whether it is beneficial to mankind or not, Am I wrong? is Rape beneficial? no, it causes Caos in the world. I hope that answers your question there. :D
that is my opinion anyways.