If you are both white/western europeans and you don't make it known you're not married - you could probably get away with it.

It's important to realize that here both adultery (which means any relations with someone you're not married to, not whether you're married or not) and homosexuality are illegal, punishable by arrest, flogging (not likely) and deportation.

That said, do people cohabit and carry on with their gay lifestyles? Yes. Do the police really care - not so much, but they WILL act on complaints - be they from a vindictive or fanatical neighbour, landlord, or coworker