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The ultimate act of intimacy is where the human male's erect penis is inserted into the human female's vagina and the male ejaculates many tens of millions sperm into the female. Only one, if any, sperm fertilizes the egg. The female anatomy is a harsh environment for the spermatazoa and only about 1 in 14 million reach either the Fallopian tube. In your conception-act only one of them you. This should prompt one to ponder one's immense [[improbability]] and dissuade one from any desire to modify the immutable eternal [[past]] in any tiny way as it might result in losing one's turn to be alive at all. It might be best to peacefully think of each iota of the past as God's Will, no matter how recent or nightmarish, surely to be studied and learned from. The act serves to unite the male and female [[gamete]]s, the [[sperm]] and [[egg]], respectively. These gametes carry just one half of the [[gene]]tic material ([[chromosome]]s) from each parent, and when they combine the new [[embryo]] contains a full set of chromosomes. The process of the gametes combining is called [[fertilization]], and takes place inside the woman's body, in the [[Fallopian tubes]] or [[uterus]]. The embryo then attaches itself to the uterine lining, and is nourished by the placenta (which in turn receives its nourishment from the mother's body) while it develops. This development takes roughly nine months (see [[Naegele's Rule]]).