There's a NSFW Far Cry 3 E3 2012 trailer from the Ubisoft E3 2012 Press Conference. You've already stopped reading. Just in case you haven't, the nude girl does have some context. Her character provides you with a little bit of background on how fierce of a warrior you are and, apparently, her motivational speech works, as you rise up and rally your warriors.
This leads the protagonist to swim to a nearby island village in the daylight and go on a rampage on the soldiers there. A couple of four-letter words are also present toward the end of this Far Cry 3 trailer, but we'll just blame that on the insanity that seems to be infecting your character.