it's called 'friday, or the other island', by a guy called michel tournier. i heard about it from the urbanomic podcast. it's like a retelling/parody of robinson crusoe, but puts a lot of theory/philiosophy in. it's like french ballard maybe, but no motorways. very funny. i think tournier was a mate of deleuze's, it sort of feels like a send up of a lot of continental philosophy. he starts to imagine the island as another being and constantly bounces between being 'good' and dutiful, hard working and total anarchy. very amusing bit where he talks about walking on all fours and how natural it seems, letting your shit drop out, then he starts rubbing himself in his shit.
he gets sexually frustrated so starts shagging trees, inspired by seeing how insects pollinate flowers. and then he starts shagging the earth generally, eanking all over the ground and loads of mandrake plants sprout up, in an area he christens the pink combe...
i should pull some quotes out cos it's so hilarious and very issensus, but it's long OOP so only got a physical copy. i think the urbanomic lad is gonna reprint it with some essays or something.