There's another slightly risque clue-16D
Soviet revolutionary family has sex in a revolutionary way.
The answer is Sputnik.
Is TUPS brit slang for to have sex?
I'm american and have never come across it before.
I can't see the word 'tup' without thinking of the magnificent Jake Thackray's song 'The Bantam Cock'. I couldn't find a video of Jake, but here's Jasper Carrot doing a passable impersonation: http://www.youtube.com/watch?v=CprQ295dxVw