Fences

Hello everyone! This past week we learned the different opinions of Rashi and Ramban about the arayot and aveirot. Rashi mentions that it is important to build fences around the arayot and aveirot because simply mentioning that we re forbidden to do them is not enough. I liked this answer because sometimes we need something extra to remind us not to do these things. However, this bothered me a little bit because how are we supposed to know what these fences are? How can we determine what to put a "fence" around? This also lead me to think about us as Jews today. It i difficult for us to follow the mitzvot, as Sade pointed out in her post, so would these special fences even make a difference in our lives today? We know that we are supposed to follow the Torah and we learn the consequences for not doing the mitzvot, but does this stop people? Where are these fences when we need them?? Every single Jew today seems to choose what they want to follow and what they are going to completely disregard. This is not the way we are ideally supposed to live, but we do anyway. Does anybody have any idea as to where there are certain fences around aveirot or arayot that could be helpful to us when trying to perform or even understand the mitzvot?