A lot of Nepali bloggers : Nepaliketi, guffadi, and shethinksofherself have written about caste and marriage, and how stupid the idea is entirely, but I have to disagree with them. I consider their views hopeless pleas of ladies and gents of a marriageable age who do not want to get married, or want to get out of the darned thing if they are in one.
You see, the caste system exists for a reason. It's not like out forefathers got up and said "Hmm, we've made life difficult already for our children and progeny, specially the girls with awkward rules for the periods and pregnancy and other stuff, so what if we complicate the matters, and then make complex rules about who gets to fall in love with whom and who gets to marry who, and who gets into trouble someone marries someone else when..." and so on. The idea is new, but his friends probably don't agree with him, because come on, they've had their eyes on some lass who does not look like them, and it would be a terrible thing if they could not hang out and make merry-age with her. So they say "Um, dude, it sounds like a fiine idea, but what justification do we give? I mean what do we tell them if they ask why the flat-noseds cannot marry the ones with sharp noses, or those with tiny eyes cannot marry others with huge eyes?" They're all hoping that the first dude who originally suggested the idea does not find solutions. And then he says, "Of course, The caste system! Hah! We tell them some lame stories about some rishis and gods and goddesses and bloodline and purity and incesty things and then throwing out of the family if he dares marry the girl with the short skirt, and then they will be too scared out of their wits to go against us..." Since no one can find the fault with the idea, they all go along.
Fun fact: the dude who suggested that intercaste marriage should be forbidden and stuff was also the first person to be executed in centuries. No idea why, but there definitely should be a connection.
So anyway, we should totally marry people of our castes only. Because if we do that, our gene pool does not get diversified enough, and after enough generations, we basically become deformed doodlies with weird body parts because we did not bring strong and interesting genes to our gene pool, but the stupid sucky ones kept on adding up, until we finally die out of inbreeding. GO SAME-CASTE MARRIAGE! AND RESPECT YOUR ELDERS!