Repeating strings is hard to refactor and comparing strings is much less efficient than comparing integers. Think about making sure every bit in two 2 * 8 * length string of bits plus overhead is the same vs two 32bit integers. The latter far fewer cycles.

  var firstTouchBehaviour = {
    touchCount: 0,
    events: {
      firstTouch: 'FirstTouch'
    }, 
    setup: function(owner) {
      andro.eventer(owner).bind(this, "touch", function(contact) {
        if(contact === "added") {
          if(this.touchCount === 0) {
            andro.eventer(owner).emit(this.events.firstTouch);
          }
          this.touchCount++;
        } else if(contact === "removed") {
          this.touchCount--;
        }
      });
    }
  };

  var soundBehaviour = {
    setup: function(owner) {
      andro.eventer(owner).bind(this, firstTouchBehaviour.events.firstTouch , function() {
        console.log("Rarrrrrwwwwwwwwwwwwwwww");
      });
    }
  };