I think the huge rate of cousin-marriage in Arab countries is also to blame:
"As of 2016, about 40% of marriages in Egypt were︀ between cousins.[18] Another source (Reproductive Health) puts the figure at 20.9-32.8% for marriages between︁ blood related partners as of 2009,[15] but much higher,60.5-80.4% -- in the region of︂ Nubia.
47-60% of marriages in Iraq are consanguine (blood related), according to a 2009︃ study in the journal Reproductive Health.[15] In Iraq the right of the cousin has︄ also traditionally been followed as cousin marriage accounts 50%.
30-40% of marriages in Syria are︅ consanguine (blood related) as of 2009.
According to a 2005 BBC report on Pakistani marriage︆ in the United Kingdom, 55% of Pakistanis marry a first cousin."
"As of 2016, about 40% of marriages in Egypt were︀ between cousins.[18] Another source (Reproductive Health) puts the figure at 20.9-32.8% for marriages between︁ blood related partners as of 2009,[15] but much higher,60.5-80.4% -- in the region of︂ Nubia.
47-60% of marriages in Iraq are consanguine (blood related), according to a 2009︃ study in the journal Reproductive Health.[15] In Iraq the right of the cousin has︄ also traditionally been followed as cousin marriage accounts 50%.
30-40% of marriages in Syria are︅ consanguine (blood related) as of 2009.
According to a 2005 BBC report on Pakistani marriage︆ in the United Kingdom, 55% of Pakistanis marry a first cousin."