I read years ago about the woman who was rescued from the Antartica research station and there is only a 3 day window 2x in the year where a plane can make the attempt to either re-supply or pick-up..
Fats forward she goes on a Tv tour. She stated that mixed groups CANNOT stay celibate. We humans are programmed to “bang”. She even stated that the first week she was there, the guys hitting on her and even the married women (to boredom and isolation) managed to have sexcapades with the other crew members... it is what it is.
Wow.
The real world example, of the isolated South Pole research stations, give us a clue what will happen on a long trip to Mars.