There is only one country on Earth, Oceania. It's a totalitarian society ruled by a person with title "the Greatest Of Dictators" (G.O.D. for short). There are videocameras everywhere, citizens of Oceania have zero privacy. Gender of all citizens is known, every citizen is either a male or a female. Sexual orientation of all citizens is also known, sex happens only if all sides want to have sex with each other.
One day G.O.D., who always was anti-sex, finally decided to ban sex for their citizens. The will of G.O.D. was following:
1.Every citizen of Oceania is forbidden from having sex with a non-citizen.
2.Every female citizen of Oceania is forbidden from having sex with anybody.
3.Every homosexual citizen of Oceania is forbidden from having sex with anybody.
Then G.O.D. gone to sleep rejoicing that all sex was banned. The next day G.O.D. woke up and requested information about enforcement of new rules. As it turned out there were no violatators, but some sly citizens were still able to have sex legally because there was a loophole in new rules. What was this loophole?