potential life

Some people who are opposed to using human embyos for stem cell research because they are "potential" humans. Well, when a cell is taken from a fetus to test for birth defects, that cell is a potential human. Eggs and sperm are potential humans. So if you are a virgin, look at all the potential humans you are preventing from existing! Of course, any time you become pregnant, that precludes many other humans from ever existing, because of all the combinations of sperm and egg which will not come to pass.