Which country was the first to have a couple in the house?
 

Which country was the first to include a couple, and was there a twist involved?

Plus, how many countries have used couples and which used them the best in twists etc. Was there a country that made the couple hide their relationship through the whole series?

Hmmm... not entirely sure, but I think the first may have Big Brother 6 USA in 2005. James and Sarah, but they weren't required to keep it secret the entire series.

I think that the first couple were Coco and Katka in BB3 Germany (2001).

http://img220.imageshack.us/img220/961/cocord3.png
http://img399.imageshack.us/img399/4297/katjavk5.png

Claire and Craig - BB1 UK (2000)
Helen and Paul - BB2 UK (2001)

I think he means housemates who went in as a couple JeanP.

Claire and Craig, and Helen and Paul were never couples inside the BB house. Helen and Paul became a couple after BB, while Craig and Claire were never together. Claire did have a baby with BB1's Tom after BB though.

But the user is talking about the housemates that entered the house as couples.

I think you may be right.