<i>Oxygen</i> is a rather high bar to compare against; by that standard you can do without food and water too.<p>You may indeed be able to find a dozen people that claim to be willing to abstain from sex for the rest of their lives. You might even find a dozen fervent believers whose religions are sufficiently compatible that they don&#x27;t kill each other before the end of the mission. But if you put them in a box for the rest of their lives, I would not bet that these vows of chastity will hold. And what then? Punishment? Voted off the space station for having sex? This sounds like a recipe for repression on a level that would impress the Saudis.<p>The Catholic Church can&#x27;t even reliably enforce chastity among its professional clergy. I don&#x27;t think this issue can be waved away.