I'm Egyptian :)
First of all, opposites attract. I know white guys who find Persan and Arab girls very attractive. Why? because they look different to the girls they know. That's all.
As for crushing on girls, I have to be completely honest with you and tell you how Arab guys think=their mentality. Arab girls are generally conservative; like we don't make out, have sex, etc..before marriage. So, in our culture that's very uncommon and frowned upon. I have male friends who, when they spend some time in Europe or the US or whatever, would be willing to experience all that with girls there because they believe they're "easy" material. Am I saying that you are? No, not at all, but that's how THEY think. Literally, that's what they say. And since Arabs are warm, friendly and charming, girls fall for them easily.
In the end, most of them wouldn't marry that gorgeous white girl, but would end up looking for an Arab girl to marry because he believes she can be a mother to his children. aka marriage material.
Arabs guys suffer from double standardism; like they can mess around with girls but wouldn't accept to marry a girl who did the same. Ofcourse there are guys who are open minded and such but I'm telling you about the majority of Arabs.
I hope what I said was useful to you. If you have any questions, please feel free to ask :)