as the man said, they are all adults, so i don't see what age has to do with it. my memory is that the female studes were just as keen to pull a 'proper pilot' as the officers were to tuck into a bit of young totty. and agreed it was far more from the holding kevs than full time instructors, who in my experience limited themselves to banter and leching from a distance.
if they are married then that is morally reprehensible but hardly Service-specific.
at the end of the day it is up to the boss of the sqn to make clear what the rules are on his trainset. and it's down to people's mates on the sqn to make sure they don't do anything stupid.
as for drinking, it's value as a bonding mechanism far outweighs any of its disadvantages - non-drinkers were never excluded and always very highly appreciated if they were picking up the pieces/doing the driving.