 The researchers noted that Arabs tended to have higher same-race preferences in countries with higher Arabic populations, possibly due to stricter religious norms on marriage amongst Muslims.The researchers did note a limitation of the study was selection bias, as the data gathered may have disproportionately drawn from people already inclined to engage in interracial dating.Currently, there are websites specifically targeted to different demographic preferences, such that singles can sign up online and focus on one particular partner quality, such as race, religious beliefs or ethnicity.