A woman finds out she is pregnant. She wants nothing to do with this child, and decides on an abortion. Her boyfriend/husband is either pro-life, or actually decides to take responsibility and raise his child. The man in this situation is powerless. The woman can march down to Planned Parenthood and kill the mans child. On the other hand if the man pushes the woman to get an abortion he is a heartless jackass. If he checks out of their relationship because she killed his child he is a heartless jackass.
