how do reproduction system
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- The human reproductive system usually involves internal fertilization by sexual intercourse.
- During this process, the male inserts his erect penis into the female's vagina and ejaculates semen, which contains sperm.
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Humans. The human reproductive system usually involves internal fertilization by sexual intercourse. During this process, the male inserts his erect penis into the female's vagina and ejaculates semen, which contains sperm.
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