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Sexual arousal phenomenon in women

How does the sexual arousal phenomenon within the women assist the fecundation?

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During sexual arousal within the women the vagina liberates substances in order to neutralize its acidity enabling the survival of the sperm cells in it. During the fertile period of female hormones that form the mucus which covers internal surface of uterus, less viscous in order to help the passage of the sperm cells to uterine tubes. During copulation, the uterine cervix advances in the vagina for facilitating the entrance of the male gametes through the cervical canal.

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