But some of their colleagues may well have engaged in some extraterrestrial hanky-panky.
Former and current astronauts don't like to talk about space-shuttle sex, and NASA says that if it's ever happened, the agency doesn't know anything about it.
Astronauts also perspire a lot in flight, meaning sex without gravity would likely be hot, wet, and surrounded by small droplets of sweat.
In addition, people normally experience lower blood pressure in space, which means reduced blood flow, which means …
, French author Pierre Kohler claimed that NASA had commissioned a study on sexual positions in outer space.(The panel-and-strap design of a space bed might not be that conducive to lovemaking.) Astronauts also have a demanding work schedule, leaving them with little time or energy for messing around.