So, why? What do you get out of this? Besides shagging a bunch of people, I mean.
For starters, being polyamorous dosen't mean you're shagging a bunch of people. It may mean that you only have one other partner.
But that's beside the point.
The answer to this question actually addresses who we are as human beings. Why do people get involved in interpersonal relationships at all? Why become romantically attached to anyone? The answer, of course, will vary from person to person, but at the end of the day we're all social animals. People are happier when they're romantically involved with someone than when they're not. Intimacy adds to the quality of your life
Fine. But why is'nt one person enough?
What would you say if you had a child, and you decided you wanted a second child, and your first child said "But why am I not enough"
The question itself dosen't really make sense, once you understand that it isn't about what's "enough"
Let's start with the fact that the majority of people are not intimate with one person. They're intimate with one person at a time...at least in theory. And with statistics from the General Social Survey suggesting that many as 34% of men between the ages of 50 to 64 will admit to having cheated at least once, evidence suggests that even the theory isn't too widely practiced.