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ejaculation is when a.

Any time a girl has vaginal sex with a guy, she is at risk for becoming As soon as sperm make it inside the vagina, they start racing toward the girl's egg.

In the human reproductive process, two kinds of sex cells, or gametes (GAH-​meetz), are involved. The male gamete, or sperm, and the female gamete, the egg.

To be fertile, a man must be able to deliver an adequate quantity of normal sperm to a woman's vagina, and sperm must be able to fertilize the egg. Conditions.

Two cisgender women (meaning assigned female at birth) in a This can happen through penis-in-vagina sex, where the sperm swim up the. If you want a baby girl, don't have sex too close to ovulation. So goes a common belief, which asserts that sperm with Y chromosomes—those.