As producers, we pay good money to get guys who enjoy fucking on film. By doing so, we create hot episodes to load into our site.
Its kind of like an expensive way of getting off but well worth it. One of the fringe benefits of being in the fuck business is the casting couch (chair, sling, etc.)... And at the end of a good day's "hard" work, we always enjoy a good fuck at home....! We are a well oiled machine.