In Copenhagen, a local sperm bank even developed a sperm-shaped bicycle that carries (you guessed it) sperm. To accomplish this, the belly of the bike has been outfitted with a nitrogen-cooled tank set to -320 degrees F to make carting samples around the city a possibility.

“We have about 15 clinics around the city, and we used to find ourselves stuck in traffic a lot of the time. By bike, it’s an easy 20 minute ride between them,” explains Dr. Peter Bower, the CEO of the European Sperm Bank.

While Bower notes he’s “taken it to the extreme,” he points out that in the cycle haven that is Copenhagen, cargo bikes are becoming the norm over cars.