I know a few reasons. One is for citizenship. They come here for college and either go home or stay in the U.S. and get married. Lots of guys from there are really into working out. They get the cute ones. The rest, either nerdy, too short, or fat end up with fats. And considering the obesity rates for women in the middle east are worse than here they would end up with a fatty anyway. I dated a fit one who had normal preferences (his whole family was thin) and I noticed the average-to-ugly friends he had were single, except a couple that settled for fats. We made fun of them. Also even in the U.S. I notice men are more likely to go for fatties if their mom is one. I went to a mosque once and all the older women (30+) were so fat. All the food they made was half olive oil. Fast food is becoming more available to them and they haven't figured out that food doesnt equal wealth anymore. Combine all that with the fact that there are religious police in Saudi Arabia who also act as the fashion police so women stay covered. Which means any skin they're shown is 'taboo' therefore 'exciting', and if they are used to fats covering at home they probably believe the stupid photoshopped/staged/perfect angle trickery that makes them slightly, just a tiny bit less disturbing. All that being said they are probably just after a green card.