I don't know...are we perhaps getting a bit precious about sex? A couple meet, spend up to 9 weeks together, and end up having sex together - well, it's hardly the first date, is it?? By this point, we've already seen them eating like pigs, drunk, washing undies, showering, and asleep; it's just another everyday activity.
Perhaps if we think it's shocking, we shouldn't be looking - after all, if it was your neighbour and you peered through their bedroom window, you'd be arrested, no matter how much you argued that they had invited you to look by leaving their curtains open.
I would have thought it was more radical to get your kit off and smear body paint over the walls on the first day like they did in BB1, or have enemas and show off your waste like Celebrity Sh*t Club (or whatever it's called).
Personally, I would like to see us overcome this taboo and move on. They should play more music in the house to get them in the mood. *That's the way, uh-huh, uh-huh, I like it, uh-huh, uh-huh.*