It is a biological and scientific fact that a person is both physically and mentally ready to have sex when the person reaches sexual maturity (around 12-13).
Only in the universe where…
…a planetary/stellar object’s gravity pulls towards big enough surfaces, not towards the object’s center. So even though this Earth is shaped like a square tabletop, gravity feels just like on our Earth everywhere.
…there’s a 30-hour day.
…the daytime sky is milky white and the sun is Navy blue.
…the largest mountain is 7500 meters high.
…Adolf Hitler did escape to South America.
…there’s another set of continents and an ocean on the other side of the planet, with Freefall Railway Tunnels drilled through the ground.