Couples Ranking Other Couples By Compatibility

What do you believe makes you compatible with someone else?  

There can be many layers to what makes people feel compatible because it is not a one size fits all decision.  Then if 'opposites attract' is factual, how does that tie with compatibility?

Watch this interesting experiment to see how each couple is ranked by compatibility.
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PART 1 - RANKING STRAIGHT COUPLES

PART 2 - RANKING SAME SEX COUPLES