Conscious uncoupling, the term that Paltrow used, would be a separation or divorce. It is also known as Coitus Interruptus in intimate situations.
Conscious coupling is just the opposite; usually engagement or marriage. In many situations, it is sex between consenting adults.
Unconscious uncoupling would be coitus interruptus where one partner, passes out and falls off.
Unconscious coupling occurs when one (or more) partner is unaware of what is happening due to alcohol or drugs.
I hope that helps to clear up any confusion.