Newton said that every object in the universe has a gravitational force towards everything else. So now lets apply that to the current life on Earth.
2 fat people are attracted not because of size, but because of gravity. Every object has a gravitational pull on everything else, so naturally 2 "large" objects have large gravitational pulls towards each other.
the mystery of the world has been solved. ;)
I don't know about that...
I would think that 2 fat people at about the same mass would move towards each other with more effort due to their similar size, where as a skinny person would gravitate toward a fat person quickly and easily with out the fat person moving towards the skinny person much at all...
Of course... you can allways fall back on what Frank Zappa (who was a thin man) said;
"The bigger the cushion, the better the pushin'."
Which ruffly states that a large mass with attract all forms of mass due to it's more cushiony ability at love making. That also makes sense as far as the theory of gravitation force that you presented because the cushion size roughly equates the mass size and thus increases the attraction. We should note that two large cushions actually work against this theory as two larger cushions (though able to combine) actually usually creat to great of an independant field of energy and negate much of the attraction. They will still combine if left with just each other, but this is not as sensible as greater effort is needed for two large objects (or small objects) to combine than a large and a small (as one in the large-small case would be drawing the other quickly near as the other would be insatiably unable to draw itself away from the larger cushion mass.)
Also, take in to account that two skinny people also gravitate toward one an other as well at roughly the same speed as two fat people. This is kind of a reluctant but agreed upon gravity as both have a gravitational force roughly equal to their cushion size (which will be much smaller) and if there are no other large people around then they are forced to combine, be it at a slow pace rather than near-instant (as in the case with large-small bodies combining.) The large bodies faced with a similar problem at the two small bodies, would not find attraction apparent unless left to only each other.
Of course it can then be addressed that once in an attraction the skinny may indeed become larger or one of the skinny may become larger to cement the attraction with a larger cushion size.
Anyway... I think this explains the point it a rough kind of way. Two large bodies will be attracted to one an other, but more reluctantly than a small and a large body.
Peace.
