If you do something wrong, you're supposed to feel bad about it. How do you know if you're doing the wrong thing or not if for once in your life, you don't feel bad about it at all?
The more you're exposed to/commit sin, the less it weighs on your conscience. You usually know if you're doing something wrong, even if you don't feel badly about it. Is what you're doing based on love? Could you hurt someone or yourself? Is it against the law? I mean, it's not usually hard to know if what you're doing is wrong.
