It sure is. They have rules to follow, so nothing that happens is really spontaneous. What Donut said sounds like an idea they stole from the Dutch. Our edition had a transvestite (a real one with all female attributes), who looked "real" enough, to fool one of the guys. And so they had sex on TV, then later she/he felt the need to come out of the closet and make the guy the "most pointed and laughed at" person in the Netherlands, by confessing she was born with a penis.
Not sure what to think of this whole situation though. Everyone i know immediately knew she was a he when they saw him on TV. You could see AND hear it, except not that one moron in the BB house.
I only wish they made his phonenumber public.