Sex is possible in space... we've done experiments using living animals. Conception has occurred. Unfortunately, the long-term effects on gestation, birth and development haven't been studied due to the short nature of our space flights.
As for human sex, it's possible, too. The Russians (reportedly) have had couples copulate in space. The inertia of a human body, as well as the natural tendency to hold on somewhat in most sex positions, make the absence of gravity not much of a problem to thrusting. Or so the theory goes. Like Will, I'm prepared to suffer in the name of science to prove (or disprove) the possibility of human sex in weightless conditions, should any of the fairer sex here be interested in joining me.
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The secret to great marksmanship is deciding what the target was AFTER you've shot.
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