In the interest of being different, and already in love with a sexy English female accent, I choose french as my next favourite sexy accent, something about a beautiful woman talking in french just makes me want to do ballet. My third choice other then those two would probably be carribean (dependant upon who) some carrebean accents sound like jibberish, while others sound 'sexy latina' as hell.
I find spanish and russian accents too strong and aggressive at times and American accent fluctuates, sometimes incredibly sexy, but quite a bit of the time downright paris-hilton-like........which isn't a good thing ¬_¬