Pop quiz: When having sex, how deep does semen need to get for pregnancy to occur?

Answer: Not that deep.

Even semen around the vaginal area or the vulva, even if it’s not inside the vagina, can lead to pregnancy.

Semen is the thick white fluid that comes out of a penis during ejaculation. This fluid contains millions of sperm cells, and if one of these millions reaches the egg cell then pregnancy occurs.

So, sperm cells themselves cause pregnancy, not the semen. The semen is there to provide food for the sperm and helps it survive, but the sperm is able to swim to the egg even without much help from its fluid transport.

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PHOTO: Flickr via Creative Commons/Eugene Luchinin