This is a bit of an ambiguous question, because not all things that are considered sinful is written down is some kind of “not to do” list.
In general, if something is not sinful or will not cause someone else to sin, it is okay to do, but this too is ambiguous, because it isn’t that simple.
Part of the Church’s job (as well as parents’ jobs) is to help form our conscience, and then we judge from our conscience what appears sinful or not. A well formed conscience will be able to spot what is sinful vs. not sinful. But sometimes, what may not be sinful for us may cause someone else to sin. For instance, it isn’t directly immoral for a woman to wear a short skirt, but by wearing the short skirt, it may cause men to lust, leading them into sin.
You are to use your conscience (not emotions) to make a judgement as to whether something you do is right or wrong. If you find fault with your conscience later on (find out something is a sin) then you can seek forgiveness and then reform your conscience with a better understanding of what is sinful vs. not sinful.
In regards to things that are written down, they are not the whole story, as I mentioned before. All things that are sinful have been written down. Some things that are sinful are derived from concepts that have been written down. Just as an example of concept: The Church says that contraception is wrong, so anything that could be used as contraception, even if it is not directly stated as contraception by way of advertising or whatever, is morally wrong.
Hope this helps