I'd have to disagree to an extent, Boudi.  Turning the other cheek does 2 things: firstly, as you suggest, it takes a bigger man to stand and take a second blow, but secondly, it actually places the opponent at a disadvantage, physically.  Whether your first blow is a back-handed or a fore-handed blow, your second blow will always be in a direction that you are unaccustomed to, and therefore opens you up to retaliation.  I'm not suggesting that we do retaliate, but in the context that Christ was speaking 'our opponent' would probably anticipate retaliation.

To put the opponent at a disadvantage perhaps, unless they use the other hand maybe?

Matthew 5:39 - also says, Do not resist an evil person - which along with 'turn the other cheek' kind of means (to me) to allow him to hit again.

Also Proverbs 24:29 - Do not say, "I'll do to him as he has done to me; I'll pay that man back for what he did."

Clearly to me this is the stance of being non aggressive