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Sexual intercourse is the action of passing the male gametes(sperms) into the female body through ejaculation.These passed sperms travel in upward direction and reach the Fallopian tube, where it would encounter the egg. Then the outer wall of the egg is broken thro' some chemicals and the nucleus of the sperm fuses with the nucleus of the egg.
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Sexual intercourse happens in both humans nd plants as well it is the pssag of ma gamete to feml gamete to produce young ones