------------------------------my reply
You write, "华裔女性50%选择外嫁,高于任何其他族裔,而印度女性外嫁极少."
(1) 何必呢?
I have never married. However I am romantic, in favor of following one's heart. In my view, love is such a rare happenstance on earth; take hold of it and never let go.
(2) It is simply untrue that Indians (men and women) from India do not marry out 外嫁.
(a) Interracial Marriage in the US: Some Simple South Asian Demographics. Gorigirl.comMay 11, 2009.
http://gorigirl.com/interracial-marriage-in-the-us
, which is based on
(b) Dr. CN Le, Interracial Dating & Marriage. Asian-Nation: The Landscape of Asian America, 2009.
http://www.asian-nation.org/interracial.shtml
("All Spouses * * * The drawback is that since most married Asian Americans are immigrants, many of them got married in their home countries before immigrating to the U.S. -- i.e., they came to the U.S. already married.")
(i) To a certain degree, among the six major Asian American ethnic groups (Indians, Chinese, Filipinos, Japanese, Koreans and Vietnamese), women born in US or who came to US before 13 (so called "1.5 generation") marry whites born here or who are 1.5 generations in a similar ratio (more than a third)--except Korean women (60.8%).
(ii) CN Le is Director ofAsian & Asian American Studies Certificate Program, University of Massachusetts at Amherst.
http://people.umass.edu/cnle/
(iii) Marriage and Intermarriage Among Asian Americans: A Fact Sheet. National Healthy Resource Center, Administration for Children & Families (ACF), US Department of Health and Human Services (HHS), undated (FS-3-09).
http://www.acf.hhs.gov/healthymarriage/pdf/marriageamongasianamericans.pdf
("Additionally, Asian/White intermarriages in the U.S. have increased in recent decades for all Asian ethnicities, and for both men and women, with the exception of Japanese women, whose rates of interracial marriages have been high since post-World War II.[9 10]")