Artistic License.
One does not "adhere" to "heterosexuality" it is, for normal men and women, just a component part of the normal state of being.
And there is probably no population on Earth with a higher ratio of shirt-lifting, mattress-munching, pillow-biting, little-boy-raping turd-burglers per capita than the muslem-Arab population of North Africa, Arabia and the Mid-East.
Sodomists are a dime a dozen there and it is very normal for men to walk about hand in hand and arm in arm and to be very physical with each other, including in public.
Arab men kiss one other as casually as the rest of the world's men shake hands.