Nope. It increases aggression according to studies but there is no causal link demonstrated between shooting people and shooting in a game.
Standard fluff. That said, the rating system should be overhauled slightly. I dont understand why a boob is 18+ but beating a near naked but boob not shown woman to repeatedly is only 15+. It might be due to USA's problem with sexuality and the very large parent associated lobby.
don't worry, the huge feminist movement in video games will take care of that.
i wonder what they would have said if they found he played skyrim