http://houston.cbslocal.com/2012/02/09/oklahoma-democrat-adds-masturbation-amendment-to-personhood-bill/ Every sperm is a possible life, thus masturbation is abortion. It's directly affecting the possibility of life.
Genesis 38:8-10 8 Then Judah said to Onan, Sleep with your brothers wife and fulfill your duty to her as a brother-in-law to raise up offspring for your brother. 9 But Onan knew that the child would not be his; so whenever he slept with his brothers wife, he spilled his semen on the ground to keep from providing offspring for his brother. 10 What he did was wicked in the LORDs sight; so the LORD put him to death also. God doesn't like facials.
Good job The whole potential argument is flawed, because exactly how far in the past the potential stops is purely arbitrary. Why stop at conception? Zygote -> (some conditions + time) -> human person Egg -> (some conditions + time) -> human person Sperm cell -> (some conditions + time) -> human person