Free Floating Marina's

Can someone explain to me the "buttocks effect" :)
Good idea but what happens in some proper lively weather ?.

For my purpose of interest there are already swing moorings in the places I can see this being a boon. In the Med I imagine if the water's are not sheltered it does not necessarily have to be for permanent moorings, a lot of the examples would do well off popular areas and anchorages. Anybody want to mention some or other island and no anchoring because of some kind of seaweed or seagrass?
 
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