A man is like a blue piece of construction paper and a woman is like a pink one.
Sex is the glue that holds them together.
Now you can pull the two pieces of paper apart afterwards, but the pink will still have some of the blue, and the blue will still have some of the pink. It wont ever actually go away. The more you glue things together and rip them apart, the more damaged the paper becomes, and the less tight the next bond will be compared to the former. The more insignificant glue becomes.