(taken from Thich Nhat Hanh, For a Future to Be Possible, 2007, Appendix 1, p107)
When you do two or three things at the same time, like eating your dinner, watching television, and having a conversation with friends at the dinner table, you do not do any of the three things deeply. You cannot truly taste and enjoy each morsel of food that your beloved one prepared for you. You cannot give your full attention to the television programme, and you will be unable to listen carefully to what your friends are saying. It is even more difficult if you have several sexual partners at the same time. Please examine this deeply. None of your relationships will be profound. Ask your heart whether you are really happy. It may seem all right now, but are you certain that you are not causing suffering to yourself or your partners? A superficial, non-committed relationship never leads to real happiness or peace.