real life wrote:
The problem with law (and marriage is sanctioned by law) is that it must be consistent.
If you are going to enshrine your 'two consenting adults' standard into law, then you must be consistent. But you are all for exceptions based on your personal perception of 'power' and so forth. So each case would have to be decided by a judge eventually.
RL, you haven't responded to either of the points I made. Which is not to say they are unassailable; nothing is. And your assertion tha "power is in the eye of the beholder" is merely that: an assertion. It's a false one. Adults have power over children, and adults living in a household with children or who have frequent contact with them in an intimate (meaning familial) way have much more sway and influence.
There is nothing wrong with drawing lines. Why here vs. there? You have to look at the macro picture. Law by its nature deals in broad strokes, so you have to look at what would likely affect most of the people. Two committed adults leads to stability both for a family and for society in general. A committed goat hasn't much to offer.
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Love the sense of humor! Welcome to A2K by the way! 
they are wrong?