Body of Desire
The Srimad-Bhagavatam describes in detail how a conditioned living entity takes birth. According to his karma, the living entity is put into the semen of a particular father, and the living entitys gross material body is manifested from the union of father and mother. During sexual intercourse, the mentalities of the father and mother are combined when the fathers semen and mothers egg mix, and this combination is acquired by the child.
Each of us has a different type of body: no ones body is identical to anyone elses. The different types of bodies have a cause, and that cause is karma. According to ones previous activities, one develops a certain kind of subtle bodymade up of mind, intelligence, and false egoand on the basis of the subtle body one gets a particular gross body. As Lord Krsna states in the Bhagavad-gita (8.6):
Whatever state of being one remembers when he quits his body, O son of Kunti, that state he will attain without fail. The character of the subtle body at the time of death is determined by the sum total of ones activities during ones lifetime. If a human being is taught to change his subtle body by developing Krsna consciousness, at the time of death his subtle body will create a gross body in which he will be a devotee of Krsnaor if he is still more advanced, he will not take another material body at all but will immediately get a spiritual body and thus return home, back to Godhead. This is the perfection of human life.

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