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The sperm enters the female body through vagina, and then enters the uterus. at the oviduct, the fusion of sperm and ovum takes place. when the sperm enters the outer pert of the ovum, its tail vanishes and the achrosome in the head of the sperm releases acids to push inside the ovum.. once inside the ovum, the nuclei of sperm and ovum fuses to restore the haploid numbers and hence, forming the zygote.
When there is sexual excitment at time of copulation that time the Sperm is ejaculated and fertilizes ovum passing through Vagina then uterus then fallopian tube(oviduct) where fetilisation takes place.