Boys have penises because they are boys. Girls do not have them. The penis is there for urination. It differentiates the boys from the girls. Later in life during puberty, the penis develops, giving another use. It can be used for sexual intercourse with the opposite sex. This is for making babies. He can also use it for masturbation, in place of intercourse. That will give him self satisfaction without involving a partner.
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Boys have penises because they are boys. Girls do not have them. The penis is there for urination. It differentiates the boys from the girls. Later in life during puberty, the penis develops, giving another use. It can be used for sexual intercourse with the opposite sex. This is for making babies. He can also use it for masturbation, in place of intercourse. That will give him self satisfaction without involving a partner.
The process of sexual reproduction requires a male and female to mix their DNA and produce offspring, as per human nature. The penis is a delivery device for the males' genetic traits (sperm) to the female ovary (the egg) via the vagina, or the receptor. This is the nature of all sexually reproducing species.
A vagina is a female reproductive organ. It id developed to accommodate the female cycles and childbirth. However if a person is born as a Hermaphrodite, that person most likely has both sex organs, but one of them is developed more than the other. In summation, boys do not have a vagina because, the vagina does not perform the biological functions that a male's reproductive system would need.
The vagina identifies a female.