Why are some interracial and intercultural relationships less common than others?

Some cultures don't seem to find love. One I just don't see so much... Asians and indians. Geographically neighbors, but don't seem to inner marry. Indians very much control their sons options, but usually the girls are free to go outside of India. Asians very much inter marry in other cultures... so they can take over the world genetically?

Another rare combination... Black/African and Indian

What have you seen?

Why are some interracial and intercultural relationships less common than others?
Why are some interracial and intercultural relationships less common than others?
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