Makes me wonder with the mission to Mars whether they will all kill each other on the way there.
More like engaging in the wildest sex actually. It's a long trip, got to do something fun and exercise muscles at the same time. Maybe it's part of the secret training... By the way I wonder if a couple have actually had zero-G sex yet, it's possible to go on those zero-G flights, so surely someone's done it by now.
Interesting question! A bunch of driven, competetive type AAA personalities cooped up in an automobile sized capsule, no privacy, no secrets, intimacy may reach new levels of interesting.
Add to that, the idea of NO rescue or hope of rescue possible if things go wrong, exposure to all possible kinds of radiation, zero G's for longer than can possibly be tested, a mixed gender crew, etc, etc, etc, yadda yadda yadda..............quite frankly, until someone comes up with a near light speed type of engine. A manned mars mission is not something that is likely in our lifetime! IMHO