What are the regulations for relationships on and off the clock?
In the new generation (Star Trek XI) Uhura kisses Spock in front of Captain Kirk. Now , Kirk and Spock were just about to try and board Captain Nero's ship to save Captain Pike. So it can be safely assumed that at least Spock was on duty as he and Uhura kiss for a while in front of other crew members and Captain Kirk.
Now I know that moments earlier, when Captain Kirk says he is also coming to try and save Captain Pike, Spock says to him:
I would cite regulations, but I know you will simply ignore it...
So no-one would expect Captain Kirk to make an issue out this, as he is not one who follows Starfleet regulations to the last word.
Was there any information on crew members fraternizing or having relationships? And what were the rules when a crew member was on duty?