Arevazi writes: The Guardian has a story about a book confirming that US and Russian astronauts have had sex in space for research programmes. The book (The Final Mission: Mir, The Human Adventure by Pierre Kohler) cites a confidential Nasa report on a space shuttle mission in 1996. A project codenamed STS-XX was to explore sexual positions possible in a weightless atmosphere. The result: only four positions were found possible without "mechanical assistance". One of the principal findings was that the classic so-called missionary position, which is so easy on earth when gravity pushes one downwards, is simply not possible.