Why is the act of cheating called "cheating" when it can mean a positive thing?

wow.......i never actually sat down and thought about it like that i agree fully i dont believe in the word cheating i kinda think the same way just in other words. i think what people call "cheating" is just building experience with other people knowing how other peoples point of View may come up in your relationship and how to handle it then it will most likely not happen