Well most things are aren't they? Lets just think about it. First comes sexual attraction, then friendship and love. The first part can come with any race and nationality. Friendship to some extent depends on shared values. Love, well who knows where that comes from?

For western men, filipinas are attractive because they are different enough to be exotic but they come from a country that is 'western' although it is in Asia. They speak good English, like the same movies, music and TV shows and share a similar culture.

So if a western guy meets a filipina girl who is good looking, great company ans shares similar values it is not surprising that love often blooms.