OK, let’s stipulate that, like all good Red Sox [team stats] fans, Ben Affleck hates the Yankees . So why is the Cambridge homey attached to direct – and possibly star in – “The Trade,” a flick about a pair of Bronx Bomber hurlers???? Well, that would be because the flick is about the biggest Yankees sex scandal of all time. No, not A-Rod and the stripper – swinging ’70s playboys Fritz Peterson and Mike Kekich who, one fine day, decided to trade wives! And get this, Ben’s rumored co-star in the tawdry tale that became a national scandal is none other than his homeboy Matt Damon.