You'd need it as much on a desert island as among other men. Men are the most important entities in every landscape. No other kind of entity has nearly the same power for your good or evil. You need a method to use other men to serve your life, to make them your values. I expect this will raise hackles.
Love is a response to values.
The method you seek, like all methods, must be based on the nature of the entity you're dealing with. Other men's natures are, to that extent, the same as your own. So, barring error, you will arrive at the same method for dealing with them that they arrive at for dealing with you. Men have got by with no more social method than the Golden Rule and a bit of common sense, but it doesn't offer specific guidance. To get any farther you have to look at your nature in more detail.