Originally Posted by WhatHappened
. . . I have yet to understand why people decide to deliberately seek out a second relationship when they're married.
Hmmm, well, I'm obviously not the OP but your question struck me as a bit odd, especially on a poly board - but it's a good one. The first things that came to my mind...
Maybe married folk seek out other relationships because being married doesn't mean you're dead and not desirous of other people in your life. Maybe because having one spouse is not the be-all and end-all we've been raised to believe it is. Maybe because there is simply an urge for more. And maybe because variety is the spice of life!