As far as cumming multiple times the only explanation i can think of is that they're splicing scenes together with breaks between. Lasting for significant periods of time isn't terribly difficult; self control and practice go a long way for that, and the rest of it can be attributed to having something to distract you from just pounding away and finishing (changing positions constantly, a director yelling at you, or just sticking a song in your head so you don't think about how damned good it feels :P )
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