The best boundary is to develop the capacity to maintain the awareness of being an emotionally separate person while relating to somebody who is very important to us and is going to affect us. There are physical boundaries and emotional/psychological boundaries. Physical boundaries are fairly cut and dry. They clearly distinguish me from you, and you from me. I can never "get inside of you" and experience what it is like to be you from the inside out. I can't physically merge with you to the point that my own self disappears. Further, it is obvious when you violate my physical boundary, and it is obvious when I violate yours. If you do something to my body without my consent - or with my active dissent - you are violating my physical boundary. And, obviously, vice-versa. So, a physical boundary isn't necessarily something we do , it is something that simply is . I have my body, and my physical boundary is where my body ends. If my body-boundary is at risk of being v...