"One can abort a fetus b/c it’s not a human life, it’s just a parasite." While we would not use the term "parasite" (because it is not a parasite), this IS the pro-choice position. As to the question of when does the fetus become a Human being, I take as a rough guideline the way that we treat the fetus when we are NOT discussing abortion. AT length: http://www.theliberalresponse.com/CommonSenseOnChoice.html