Well, there is much more merging in poly than swinging (I started a thread on merging once, I wonder if that would help). The emotional component is a much larger and important component than sex. The depth and connection is perhaps more as a result, I don't know. Swinging doesn't involve love; in fact saying "I love you" is quite often a firm rule. In poly love comes first. Its not a friendship with sex on the side, its a romance, a love affair. Its partnership. Much different.
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