Semen travels at 28mph.

Semen travels at 28 mph.

More info: Once sperm enter the vagina, they slow down like four lanes merging into one: It takes 5 minutes for them to travel the 6 inches to the cervix and can take up to 72 hours to reach an egg.

Also, the average erect penis is 6.21 inches, and a man will produce 14 gallons of semen in his lifetime - enough to fill up the tank of a car.