Sure, they're fundamentally different. A two escort booking is a doddle, because both escorts are complicit in the fakery. With a couple booking one has to please 2 people, who both expect you to be "genuine". I had one earlier this week, and it was good fun, the lady was charming and the guy super horny of course, but a couple booking usually means the guy wants to watch you do the full on lesbian thing with "his" woman, and there's no pretending.