Durdle Door - right at the end (away from the arch), been there loads of times, it's quite a walk but worth it, except you can be overlooked from the cliffs in some places.
Mupe Bay - Access from the end of Lulworth Cove and walk across the army ranges which are open in the Summer. It's a very quiet beach due to the long walk, but again I have been there many times, it's my preference over Durdle Door because my wife would go naked there
