Their culture is more closed off, they're more traditional, their families often disapprove. The Rise of Asian Americans | Pew Social & Demographic Trends I don't know if this applies outside of the US, but here in Northern California, this is pretty noticeable.
Religion is a big part of their lives, whether Hindu, Muslim or Buddhist, so I don't know how they feel about inter-faith marriages. I have noticed that here in Canada, Indians very much stick to themselves.
I think religion plays a large role in this as the number of Hindus, Sikhs, or Jains who aren't "Indian" are more or less negligible.
In my own extended family, the 1.5/2nd generation is all Americanized/Westernized but most of my "cousins" ended up choosing to marry other Indians.(a=f);var b=i(a);if(CSS&&!