Rapunzel, will you marry me, and make me the happiest man on earth?
Yes, I will marry you!
Flynn's sperm enters Rapunzel's vagina.
Lets find that egg!
Its so warm in here!
Rapunzel let's down her hair to her unplugged cervix.
Now is our chance!
She's letting us in!
As soon as Rapunzel and Flynn see each other, they fall madly in love. Their first night in the castle, they have sex.
The uterus war zone.
Get out of here! Our job is to protect her!
Millions of Flynn's sperm enter the vagina, but most of them quickly die within minutes due to acids that are administered to keep the vagina clean.
The road to the egg.
My prince... you found me! Which one of you will win?
Flynn's 60,000 remaining sperm push each other violently to get through Rapunzel's cervix. However, the cervix has many paths that lead to nowhere and this will result in many sperm dying.
The resting place for the next nine months.
Now only a few thousand sperm remain. The uterus helps to move the sperm in the right direction to the correct fallopian tube. However, an army of white blood cells attack the sperm.
No! We need to get to that egg!
With only 10-30 sperm left, they are now safe from the white blood cells. The fallopian tubes nourish the sperm, so that they can stay alive for hours, or even days. Rapunzel's egg is released from her ovary, and finds Flynn's sperm. The sperm fertilizes the egg.
I will win!
Then now fertilized egg travels back through the fallopian tube, to the uterus. The egg tries to find just the right spot to lay to rest. Once a spot it chosen, the fertilized egg implants into the wall of the uterus. This process is called implantation.