Silly answers:maypole dancinga pinwheelwaiting for a fifth for a starfish??
I don't know what they are doing but a 4-way gamete exhange doesn't seem likely to me. But I'm certainly no expert on the sex lives of gastropods.
I think they are mating because of the thread like structures connecting their hind ends together (obvious on close inspection of the original photo). But I have never seen anything like this before.
Gastropods following a crustacean example? Lewis Carroll mentioned a lobster quadrille. Could this be the first sighting of a slug quadrille. "Take your partners and proceed very slowly around!"
in search of higher levels of wisdom I have posted a query on wild about Britain see .. http://www.wildaboutbritain.co.uk/forums/insects-and-invertebrates/73306-slug-fest.html#post659112
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