Sexual gratification is the act of pleasing or satisfying one's sexual urges or others'. One of its kind is sexual sadism which is a sensual and sexual gratification derived from inflicting pain on a victim or seeing their victim suffer. It is a paraphilic coercive disorder wherein it inflicts continuous harm upon its victim even without the latter's compliance which sometimes lead not only to his/her eventual death but also defacement of his/her body.
Some individuals are more likely to survive and reproduce than others because they are fit and easily adapting. This idea is called 'survival of the fittest'.
