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You are Sammy the Sperm, on a quest to escape the testes and fertilize an egg to create new human life. Swim straight up. There’s another sperm blocking the vas deference. Ask him who he is and where everybody else is. Then ask him to let you enter.
In case you want to enter, you have to answer three question right.
Question 1: 14 gallons
Question 2: Excercise, eat right and don’t smoke,
Question 3: 30 centimeters
There you go, you now can pass. Find your way through the vas deference. Victory when you’re at the end.
Game source: A copy of the game was found here  on the internet.