What moron at 23 weeks gestation needs informed consent? By that time the baby moves, and moves a lot. There is a life inside her that she cannot ignore by this point. Either you are male, never had a baby, or been in the desert way too long. 23 weeks gestation is way past the informed consent stage, unless she is numb from the neck down.
Excuse me; I am a woman; I have a son, and I'm an RN in a NICU. You'd be surprised at how many young women didn't even know they were pregnant... the movement was gas, etc.
Denial is a very potent defense mechanism.