Ah yes, the original Chad versions of SCP-173.

That's because back during the days of the Renaissance, it was believed that having a smaller penis was more masculine. It wasn't until the 20th century with sexuality becoming more socially acceptable to discuss and study that people started to realize that a bigger dick is actually better because 1,more pleasure for both partners and 2, increased chance of pregnancy because the sperm has less of a distance to travel to the egg.