The average porn scene might last 20 minutes. In that time, the performers make their way through a circuitous succession of great-looking positions. It’s fluid, if mechanical, with the actors standing up and repositioning themselves every few minutes. In reality, though, the director is taking them aside between shots, coaching them on what to do — thrust harder, cup her right breast, grip her right leg. During these instructional moments -- the porno equivalent of a mid-assignment update from your boss — the actor has to maintain his erection so that he can go right back to work without delaying the shoot. When you’re having sex, you might stop for a breather, but no one will appear to appraise your performance and offer directives while you regain your composure.
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