I believe the answer is: motivations.
When you understand your motivations, you would most likely wouldn't stop unless your end goal is achieved because you feel a strong drive for a certain change. Because of this, the likelihood of you staying within your plan would also be increased.
The Double Jeopardy Clause of the Fifth Amendment.
Hippocrates was a free resident of greek.
When we label a sexual behavior natural or unnatural, we are indicating whether the behavior conforms to our culture's sexual norms.