So, pregnancy. The short explanation is when sperm meets an egg, the egg is fertilized by the sperm, and becomes a zygote. There is a long process from fertilization to zygote to embryo to becoming a baby, and this process takes 9 months. I am going to go into more details for you to help you understand. (One note – when I am talking about “female” and “male”, I am referring to the biological or birth physical sex of a person. If a person is transgender, their reproductive tract will function the way their “birth sex” reproductive system would, unless surgery or hormones have changed that as part of their transitioning.)
Here is a picture of the female reproductive tract:
The next picture shows the path (the pink dots) that the egg travels. If it doesn’t get fertilized, it just keeps on going right out the vagina. The egg is too tiny to see without a microscope.
This picture shows the path that sperm travel (blue dots):
Only one sperm wins.
Two take home points:
- If you are going to have sex or pre-sex that is going to get sperm near the vagina of a female and you don’t want to get pregnant, use reliable birth control (and always a condom with it to prevent STDs!).
- And, masturbation (“humping a pillow, towel”) alone cannot make you pregnant.