Never know, a few of these female athletes may have won gold having been knocked up a few nights before.
Most of the action takes places after the athletes have competed in their event.
It makes perfect sense. You have devoted yourself for years to the race/fight/routine of your lifetime and after having competed find yourself with a lot of time to kill, no immediate purpose, in a foreign city and surrounded by young, superfit athletes from around the world who are just as eager to let themselves go.
The second week of the Olympics really is Durex wet dream. Pardon the poor analogy.