Hope it is useful for some of you in the planning stage. For those of you do not have any plan in the near future, you can keep it for future reference.
Background:
Man's sperm consist of X and Y spermatozoa, X spermatozoon decides the female whereas Y is the male. Referring to these physiological properties of the spermatozoa, gynecologists set up the theory of "Choice of a Girl or Boy".
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