What the world hasn't grasped is the great irony of this situation. The Catholic's church objection to contraception comes from the story of Onan. Onaon married his dead brother's wife Tamara, and wouldn't give her a child, so he would pull out and spill his seed on the ground. God killed Onan for this. So the Catholic church has made both contraception and masturbation a sin from this unlikely tale. (Notice how the men are not trying to control jerking off.) Now the real irony comes in the Catholic's church view of contraception which is no artificial means can be used...however you can prevent contraception by pulling out and spilling your seed for the money shot...the same reason why it is a sin in the first place.
"On Earth as it is in Heaven, the Cosmic Roots of the Bible" available on the Amazon.