When a man and woman are married, they engage in sexual intercourse, or sex. The spermatazoon cell meets with an egg cell and turns into a baby, and the woman is pregnant, and homes a baby for nine months, then gives birth.
When a naked man inserts his penis into a naked women's vagina. The man thrusts deeply and the women makes groaning noises until the man's penis becomes erect and exrets a white liquid called semen.