In fact this is the first time I've even heard of such a requirement! There is no such requirement and this is probably one more of those urban myths people create about Hinduism. Furthermore some people confuse some practices unique to certain regions/tribes with Hinduism.
Some of the other common myths associated with Hinduism, to this day are the "holy cow" and "Hindus have 300 million gods.
People do not realize that the "holy cow" issue most probably rose out of economic reasons instead of religious ones.
I remember a pastor (the kind that waylay people on the road intersections) ask me "why dont you eat the cow?". Instead of giving him the long explanation (which I would have given to anyone else...except to missionaries) I asked him "would you eat your dog?". For which he said "of course not! its my pet!, and the cow is not". I told him, For the people from the subcontinent, the cow too is considered a pet.
The longer explanation is that the Indian culture is overwhelmingly an agrarian one. Thus milk, and varieties of beans were/are our main source of protein. This is evident if one looks at Indian cuisine...there is so much dairy-dairy derivatives in it. The bulls also were the main mode of transport, and farm labour (threshing, transporting carts). Prohibiting the slaughter/consumption of such a versatile and important animal made total economic sense. Added to this is the Indian notion that because the cow gives us milk, the same way a mother's milk sustains a baby's life, the cow is equal to a mother. Killing the cow thus also became equated to killing one's own mother. Later on, after millenia.. the reason was forgotten, and only the "cows should not be eaten/harmed" remained. For all intents and purposes cows came to attain the social/practical significance dogs/cats have attained in the west. Thus when one applies the principle of cultural relativism to the "holy cow" issue, one realizes that this is no different or bizarre than one's desire not to eat dogs and cats which one considers pets.
ps: on a funny note...both Indians and Westerners would be both equally affronted that some Koreans/SEA people eat dogs.lol...its all culturally relative
The other common misconception, that Hindus have 300 million gods (so oft found on so called "authoritative" books about Hinduism...not to mention school textbooks here in the west) is also an urban myth. Hindus see the divine in all things, in both animate and inanimate objects, Hindu schools of philosophy range from Pantheism/panentheism to monotheism..monism..and atheism.
The 300 million gods figure has a very good reason behind it..sadly the person to whom the number was quoted to, was probably too clueless to understand the reason behind it
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^^ if one looks at the above population figures, the Indian population reached 300 million during the British rule. This coincidence, with the 300 million gods number is not an accident. When asked about the number of gods, a pundit (Hindu Scholar) probably gave the number of Hindus instead. Hindus believe that the divine(or for Hindu Atheists or non-dualists the lack thereof) can be found in each and any path. Thus naturally 300 million Hindus would have 300 million paths/gods, as it stands to reason that no two humans are alike..and by extension, no two paths would be the same. Some British Bureaucrat...or worse yet..some "Historian" decided that this is a good number..and without any inquiry into the reason behind the number, jsut perpetuated the myth that there are 300 million gods in Hinduism. Only when one looks at historical facts, along with demographic/economic trends, one realizes the reason behind such answers. Sadly, even to this day many American textbooks perpetuate such myths about Hinduism....the same way they still used to claim incorrectly(at least not anymore) that the Numerals and Zero were invented by Arabs, instead of Indians.
My apologies for digressing :). But I hope this post puts such urban myths in context.
As for the male-child requirement...its not even an urban myth..obviously a false statement by someone.
Hope this helps. Don't hesitate to ask questions if you have any :)