British scientist claims NASA is considering chemical sterilisation of Mars mission astronauts, among other things. Here's some more:

[quote]....scientists such as Professor Powell are concerned that the emotional fallout from having a crew where some are happier than others, or where relationships are made and then fall apart, could be disastrous. He noted the comments of one Russian cosmonaut about time spent cooped up in the Mir space station that "when you have two people locked up in a very small environment for months at a time, all the conditions for murder are met." Mix in sex, and you almost have the script of Othello in space.

Other scientists have suggested that the best way to ensure there is no interplanetary interplay is to crew the mission with astronauts over the age of 50. "The idea is that they won't be worried about having families and concerned about getting exposed to radiation, because they're getting towards the end of their useful working lives," explained Peter Bond, a British expert on space matters.

"Alongside that is the idea that the ideal Mars mission would have - in Star Trek terms - two Mr Scotts and two Mr Spocks, and definitely no Captain Kirks, or Mr Sulus, or Dr McCoys. You need the Scotts to do the engineering stuff, and the Spocks to do the science. You don't need a Kirk because all he does is issue orders - and kiss any woman in sight."[/quote]

And here's the article:
[url=http://news.independent.co.uk/world/science_technology/story.jsp?story=516336]Sex: The Final Frontier[/url]

Hmmmmm.....
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