The "surprise" element is a common media trope that has been criticized by some for sensationalizing transgender identities or presenting them as a "shock" rather than a lived reality.
Despite criticisms of its framing, the series' longevity (from 2002 through at least 2017) indicates it was one of the most successful commercial brands in its category for nearly two decades. AVN 2012 Awards Nominations Overview | PDF - Scribd tranny surprise reality
The series uses a "gonzo" or reality-style cinematography designed to make the encounters feel spontaneous and unscripted. The "surprise" element is a common media trope