Maybe it's just me, but from what I can see in general white skin seems to be the most preferred especially when it comes to dating (people with darker skin sometimes bleach their skin in order to appear lighter) or perhaps it's just due to white people dominating the Western society and receiving more positive media publicity and to an extent people being conditioned to think according to certain societal standards, which happen to include the admiration of light skin in a potential date.
Discuss. (inb4 the obligatory 'but I prefer xxx race so you're wrong', that really isn't the point...)
Edit - I'm not trying to be racist or anything here, just a trend that I've noticed