*You can basically do what you like. Your conscience is not the source of creative thinking, but helps you live your life based on your values and beliefs.
*Your writing, based on your conscience will be your interpretation of what is right and wrong anyway.
*People portray murder, suicide, rape, magic, cannibalism and all sorts of other detestable things in their novels. This does not mean the author is trying to persuade impressionable people to do these things, but are just using their creativity to paint imaginative worlds and gripping stories with interesting characters.
*Age restrictions used by adults allow them to govern what their children watch, read, ect.
*Most Disney and other children's books/movies create unrealistic or unhealthy ideas of what love is and paint unrealistic worlds. That doesn't mean they can't be enjoyed. Fantasy is always going to be unrealistic in some way or another.
*In the end, what responsibility is there to creativity? Don't be too creative? Limit your creativity? You'll find the answer will be the total opposite. Explore every dark corner, as well as every bit of light you have in your being. Embrace yourself as completely human with feelings that must be expressed, no matter how obscene or repulsive, wonderful and spectacular, morally correct or incorrect and impressionable or not.
If the reader doesn't like what they read, see or hear, they can always walk away or stop reading and go do something else. That is their responsibility