strategy - Russian roulette

You are challenged to a game of Russian roulette. Your opponent places two bullets side by side in a six chamber revolver and spins the chamber. She explains that the game is single turn-based and MUST be played through to its conclusion. She then offers that you can choose who goes first. Should you go first, or let her?

Edit: In my envisioning of the scenario the cylinder is spun once and once only, at the beginning of the game.