Just as we reject racism sexism ageism and heterosexism we reject speciesism. The species of a sentient being is no more reason to deny the protection of this basic right than race sex age or sexual orientation is a reason to deny membership in the human moral community to other humans.
Marriage of attraction is a gamble anyway so you might as well marry into a family that is similar to your own and make that much less of an adjustment. But the 'love marriage' as it is called is equally common in India now. But it would be interesting to do a comparison of what would work better. Marriage is hard work and it is a gamble.