I hate to contradict you
but the reference to NASA flight surgeons wasn't accidental. Rumors persist that the flight surgeons started seeing spikes in physiological telemetry once NASA started flying mixed crews, and have quietly debriefed (no pun intended) the participants after the flight. The betting is that nobody raises a fuss because the scientists are genuinely curious about the effects of the environment on all sorts of human activity. If we intend to live in space someday, that includes having sex in space. And humans being humans, sooner rather than later is something we can all understand.
Lucky bastards, as if just flying in space wasn't privilege enough.