Since porn is more of a sex toy than a "sex aid," it will add to (not fix) the current state of your libido. So, just as with any other sex toy, it helps if you're aroused before you begin watching porn. When you're ready to put the tape in and press "play," be sure to have the following items ready: lube, dildo, vibrator, towel, or all of the above, plus the remote control. Having a sex toy ready if you need it is handy; if the video turns you on and you want to get off, you won't have to interrupt your pleasure to search around for your toys.
But why the remote control? It's the only really required item for porn viewing: you'll need to fast forward through anything you don't like, or whatever distracts you from your arousal—be it lame dialogue, a sex act you don't care for, or a performer who leaves you cold. For some people this may seem like a hassle at first—why, you ask, can't the industry just make good porn?
The makers of porn try to appeal to as many tastes as possible in a relatively short amount of production time; they're also controlled by distributors who have fairly antiquated ideas about sex and sexuality—and especially about what people really want to see. Also, porn has to get to the point pretty quickly to retain horny viewers who usually want instant gratification, and so, as in Hollywood, the folks who make porn have boiled down their scenarios into formulas based on what they think viewers want.