Since they desire to produce offspring, they'll commit themselves to the nearest member of the opposite sex, most of the time an easy to dominate underage cousin or even a sister or daughter.
Because they've accustomed themselves to the utmost bizarre islamic rituals already for over a millennium, they've bred into themselves upto a degree that they're often barely recognizable as Homo Sapiens.
Because of this scientists indeed are coming more and more to an agreement to put turks into a seperate class within the human falily tree:
Turks are deemed to be called the "Homo Fetor Vulgaris Islamicus".
Source: National Geographic, Scientific American