var isGayExecuted=false;

var iAmGay = function(){
    console.log('I am gay')
}

var doSomething = function(callback){
    console.log('doSomething')
    if(!isGayExecuted){
        callback();
        console.log('doSomething.callback executed')
        isGayExecuted = true;
    }
}

doSomething(iAmGay);
doSomething(iAmGay);