answers
1. Better body definition (and can let you swim faster according to some - but better make sure the fit is good as loss of shape in some materials can make it a mistake)
2. Swimmers might do that in training for a drag effect and so make them work harder on their lap times. Less so now but formerly common practise in water polo as a defence against aggressive underwater grab and pull tactics.
(somewhere on the www is a pic of a water polo international emerging from the pool with no bum cheek cover left on his speedo!)
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