You’re right about faking; it doesn’t help anyone, and you can’t expect a man to know what you like if you’re pretending all the time (although, it’s a great way to end it quickly if the sex is bad). But if it even gets to the point where you have to fake it, you need to reevaulate your idea of sex–it’s not a service to him, it’s a mutually enjoyable activity. And if a guy can’t tell whether you’re enjoying yourself or not, no tutorial is going to help him get better at it. He either knows how to read signals (and is willing to) or he doesn’t.