Skin color has a strong bearing on one's association with a culture. As one grows older, one's willingness to "experiment with newer cultures" gets narrower. Rightly or wrongly, most of us have an inborn affinity to our own clan and culture and consequently to our skin color too.
Like skin color, most of us have our affinity to our religion, religious sects, mother tongue, native country, native place and so on. All these affinities become more and more important and meaningful to us as we age.
In India, this affinity tends to get further narrowed down to the caste system. Indian parents want to have the highest say in the selection of a spouse for their children, because they want to ensure compatibility between the spouses in the long run.
My article on the success of Indian marriages may be of interest to you: